include/exec: Split out icount.h

Split icount stuff from system/cpu-timers.h.
There are 17 files which only require icount.h, 7 that only
require cpu-timers.h, and 7 that require both.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

system/cpu-timers.c

@@ -36,6 +36,7 @@
 #include "hw/core/cpu.h"
 #include "system/cpu-timers.h"
 #include "system/cpu-timers-internal.h"
+#include "exec/icount.h"
 
 /* clock and ticks */
 

system/dma-helpers.c

@@ -13,7 +13,7 @@
 #include "trace.h"
 #include "qemu/thread.h"
 #include "qemu/main-loop.h"
-#include "system/cpu-timers.h"
+#include "exec/icount.h"
 #include "qemu/range.h"
 
 /* #define DEBUG_IOMMU */

system/vl.c

@@ -89,6 +89,7 @@
 #include "audio/audio.h"
 #include "system/cpus.h"
 #include "system/cpu-timers.h"
+#include "exec/icount.h"
 #include "migration/colo.h"
 #include "migration/postcopy-ram.h"
 #include "system/kvm.h"