accel: move kvm related accelerator files into accel/

move kvm related accelerator files into accel/ subdirectory, also
create one stub subdirectory, which will include accelerator's stub
files.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <1496383606-18060-5-git-send-email-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/Makefile.objs b/Makefile.objs
index 871eca8..6e5c706 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -163,6 +163,7 @@
 trace-events-subdirs += linux-user
 trace-events-subdirs += qapi
 trace-events-subdirs += accel/tcg
+trace-events-subdirs += accel/kvm
 
 trace-events-files = $(SRC_PATH)/trace-events $(trace-events-subdirs:%=$(SRC_PATH)/%/trace-events)