qemu: arm: select QFW, MMIO on qemu-arm

Select CMD_QFW and QFW_MMIO in the qemu-arm board (covers arm and
arm64).

Signed-off-by: Asherah Connor <ashe@kivikakk.ee>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>