Include qemu-common.h exactly where needed

No header includes qemu-common.h after this commit, as prescribed by
qemu-common.h's file comment.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190523143508.25387-5-armbru@redhat.com>
[Rebased with conflicts resolved automatically, except for
include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c
block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c
target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h
target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h
target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h
target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and
net/tap-bsd.c fixed up]
diff --git a/hw/core/irq.c b/hw/core/irq.c
index b98d1d6..7cc0295 100644
--- a/hw/core/irq.c
+++ b/hw/core/irq.c
@@ -23,7 +23,6 @@
  */
 #include "qemu/osdep.h"
 #include "qemu/main-loop.h"
-#include "qemu-common.h"
 #include "hw/irq.h"
 #include "qom/object.h"
 
diff --git a/hw/core/loader.c b/hw/core/loader.c
index a097bbe..425bf69 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -43,6 +43,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu-common.h"
 #include "qapi/error.h"
 #include "hw/hw.h"
 #include "disas/disas.h"
diff --git a/hw/core/null-machine.c b/hw/core/null-machine.c
index 76d3f8e..04a1e2b 100644
--- a/hw/core/null-machine.c
+++ b/hw/core/null-machine.c
@@ -12,7 +12,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "qemu-common.h"
 #include "qemu/error-report.h"
 #include "hw/hw.h"
 #include "hw/boards.h"