Remove exec-all.h include directives

Most exec-all.h include directives are now useless, remove them.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/kvm-stub.c b/kvm-stub.c
index 1e835c6..06064b9 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -12,7 +12,7 @@
 
 #include "qemu-common.h"
 #include "hw/hw.h"
-#include "exec-all.h"
+#include "cpu.h"
 #include "gdbstub.h"
 #include "kvm.h"