dm: sandbox: mmc: Enable building MMC code for sandbox

Enable building the MMC code for sandbox. This increases build
coverage for sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>

configs/sandbox_defconfig

 CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_MMC=y
 CONFIG_PCI=y
 CONFIG_DEFAULT_DEVICE_TREE="sandbox"
 CONFIG_I8042_KEYB=y
@@ -97,6 +98,7 @@ CONFIG_PWRSEQ=y
 CONFIG_SPL_PWRSEQ=y
 CONFIG_RESET=y
 CONFIG_DM_MMC=y
+CONFIG_SANDBOX_MMC=y
 CONFIG_SPI_FLASH_SANDBOX=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_ATMEL=y

include/configs/sandbox.h

@@ -215,4 +215,6 @@
 #define CONFIG_SYS_SYSTEMACE_WIDTH	16
 #define CONFIG_SYS_SYSTEMACE_BASE	0
 
+#define CONFIG_GENERIC_MMC
+
 #endif

test/dm/blk.c

@@ -83,12 +83,12 @@ static int dm_test_blk_usb(struct unit_test_state *uts)
 	ut_asserteq_ptr(usb_dev, dev_get_parent(dev));
 
 	/* Check we have one block device for each mass storage device */
-	ut_asserteq(3, count_blk_devices());
+	ut_asserteq(4, count_blk_devices());
 
 	/* Now go around again, making sure the old devices were unbound */
 	ut_assertok(usb_stop());
 	ut_assertok(usb_init());
-	ut_asserteq(3, count_blk_devices());
+	ut_asserteq(4, count_blk_devices());
 	ut_assertok(usb_stop());
 
 	return 0;