sh4: include cpu-qom.h in files that require SuperHCPU

This will keep things working when cpu.h will not be included
indirectly almost everywhere (either directly or through
qemu-common.h).
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

include/hw/sh4/sh.h

@@ -3,6 +3,7 @@
 /* Definitions for SH board emulation.  */
 
 #include "hw/sh4/sh_intc.h"
+#include "target-sh4/cpu-qom.h"
 
 #define A7ADDR(x) ((x) & 0x1fffffff)
 #define P4ADDR(x) ((x) | 0xe0000000)