qapi: Split machine-target.json off target.json and misc.json

Move commands query-cpu-definitions, query-cpu-model-baseline,
query-cpu-model-comparison, and query-cpu-model-expansion with their
types from target.json to machine-target.json.  Also move types
CpuModelInfo, CpuModelExpansionType, and CpuModelCompareResult from
misc.json there.  Add machine-target.json to MAINTAINERS section
"Machine core".

Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190619201050.19040-13-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
[Commit message typo fixed]
diff --git a/target/arm/helper.c b/target/arm/helper.c
index df4276f..7caea52 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -21,7 +21,7 @@
 #include "sysemu/kvm.h"
 #include "fpu/softfloat.h"
 #include "qemu/range.h"
-#include "qapi/qapi-commands-target.h"
+#include "qapi/qapi-commands-machine-target.h"
 #include "qapi/error.h"
 #include "qemu/guest-random.h"