exec/ram_addr: Include missing 'exec/hwaddr.h' and 'exec/cpu-common.h'

'hwaddr' is defined in "exec/hwaddr.h", 'ram_addr_t' in
"exec/cpu-common.h". Include these headers in order to
avoid when refactoring unrelated headers:

  In file included from ../../hw/s390x/s390-virtio-ccw.c:17:
  include/sysemu/physmem-target.h:37:24: error: unknown type name 'hwaddr'
     37 |     (MemoryRegion *mr, hwaddr offset, hwaddr length, unsigned client);
        |                        ^
  In file included from ../../hw/s390x/s390-virtio-ccw.c:16:
  include/exec/ram_addr.h:52:36: error: unknown type name 'ram_addr_t'
     52 | RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
        |                                    ^

Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Message-Id: <[email protected]>

include/exec/ram_addr.h

@@ -28,6 +28,9 @@
 #include "exec/exec-all.h"
 #include "qemu/rcu.h"
 
+#include "exec/hwaddr.h"
+#include "exec/cpu-common.h"
+
 extern uint64_t total_dirty_pages;
 
 /**