Move target-* CPU file into a target/ folder

We've currently got 18 architectures in QEMU, and thus 18 target-xxx
folders in the root folder of the QEMU source tree. More architectures
(e.g. RISC-V, AVR) are likely to be included soon, too, so the main
folder of the QEMU sources slowly gets quite overcrowded with the
target-xxx folders.
To disburden the main folder a little bit, let's move the target-xxx
folders into a dedicated target/ folder, so that target-xxx/ simply
becomes target/xxx/ instead.

Acked-by: Laurent Vivier <laurent@vivier.eu> [m68k part]
Acked-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> [tricore part]
Acked-by: Michael Walle <michael@walle.cc> [lm32 part]
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> [s390x part]
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> [s390x part]
Acked-by: Eduardo Habkost <ehabkost@redhat.com> [i386 part]
Acked-by: Artyom Tarasenko <atar4qemu@gmail.com> [sparc part]
Acked-by: Richard Henderson <rth@twiddle.net> [alpha part]
Acked-by: Max Filippov <jcmvbkbc@gmail.com> [xtensa part]
Reviewed-by: David Gibson <david@gibson.dropbear.id.au> [ppc part]
Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> [cris&microblaze part]
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> [unicore32 part]
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/hw/ppc/fdt.c b/hw/ppc/fdt.c
index e67d60d..38a7234 100644
--- a/hw/ppc/fdt.c
+++ b/hw/ppc/fdt.c
@@ -9,7 +9,7 @@
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
-#include "target-ppc/cpu.h"
+#include "target/ppc/cpu.h"
 
 #include "hw/ppc/fdt.h"
 
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 9df7b25..83597fe 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -22,7 +22,7 @@
 #include "sysemu/sysemu.h"
 #include "sysemu/numa.h"
 #include "hw/hw.h"
-#include "target-ppc/cpu.h"
+#include "target/ppc/cpu.h"
 #include "qemu/log.h"
 #include "hw/ppc/fdt.h"
 #include "hw/ppc/ppc.h"
diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
index 76ce854..d79d530 100644
--- a/hw/ppc/pnv_core.c
+++ b/hw/ppc/pnv_core.c
@@ -20,7 +20,7 @@
 #include "sysemu/sysemu.h"
 #include "qapi/error.h"
 #include "qemu/log.h"
-#include "target-ppc/cpu.h"
+#include "target/ppc/cpu.h"
 #include "hw/ppc/ppc.h"
 #include "hw/ppc/pnv.h"
 #include "hw/ppc/pnv_core.h"
diff --git a/hw/ppc/pnv_lpc.c b/hw/ppc/pnv_lpc.c
index 0e2117f..78db524 100644
--- a/hw/ppc/pnv_lpc.c
+++ b/hw/ppc/pnv_lpc.c
@@ -19,7 +19,7 @@
 
 #include "qemu/osdep.h"
 #include "sysemu/sysemu.h"
-#include "target-ppc/cpu.h"
+#include "target/ppc/cpu.h"
 #include "qapi/error.h"
 #include "qemu/log.h"
 
diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
index 8da2718..b82af4f 100644
--- a/hw/ppc/pnv_xscom.c
+++ b/hw/ppc/pnv_xscom.c
@@ -21,7 +21,7 @@
 #include "hw/hw.h"
 #include "qemu/log.h"
 #include "sysemu/kvm.h"
-#include "target-ppc/cpu.h"
+#include "target/ppc/cpu.h"
 #include "hw/sysbus.h"
 
 #include "hw/ppc/fdt.h"
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index e0c14f6..c18632b 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -8,14 +8,14 @@
  */
 #include "hw/cpu/core.h"
 #include "hw/ppc/spapr_cpu_core.h"
-#include "target-ppc/cpu.h"
+#include "target/ppc/cpu.h"
 #include "hw/ppc/spapr.h"
 #include "hw/boards.h"
 #include "qapi/error.h"
 #include "sysemu/cpus.h"
-#include "target-ppc/kvm_ppc.h"
+#include "target/ppc/kvm_ppc.h"
 #include "hw/ppc/ppc.h"
-#include "target-ppc/mmu-hash64.h"
+#include "target/ppc/mmu-hash64.h"
 #include "sysemu/numa.h"
 
 static void spapr_cpu_reset(void *opaque)