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

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 <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20241218155202.71931-4-philmd@linaro.org>