qemu: add MMIO driver for QFW

Add MMIO driver for QFW.

Note that there is no consumer as of this patch.

Signed-off-by: Asherah Connor <ashe@kivikakk.ee>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 2864b84..0c67d43 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -58,6 +58,7 @@
 ifdef CONFIG_QFW
 obj-y += qfw.o
 obj-$(CONFIG_QFW_PIO) += qfw_pio.o
+obj-$(CONFIG_QFW_MMIO) += qfw_mmio.o
 obj-$(CONFIG_SANDBOX) += qfw_sandbox.o
 endif
 obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o