test: qemu: add qfw sandbox driver, dm tests, qemu tests

A sandbox driver and test are added for the qfw uclass, and a test in
QEMU added for qfw functionality to confirm it doesn't break in real
world use.

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/test/dm/Makefile b/test/dm/Makefile
index f5cc554..d54abb7 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -98,5 +98,6 @@
 ifneq ($(CONFIG_EFI_PARTITION),)
 obj-$(CONFIG_FASTBOOT_FLASH_MMC) += fastboot.o
 endif
+obj-$(CONFIG_QFW) += qfw.o
 endif
 endif # !SPL