mx6memcal: Finish migration to defconfig options

The config header for this platform uses '#undef' in a number of cases.
All of the MMC related ones were already handled correctly in the
defconfig file.  In the case of CONFIG_CMD_FUSE, the command was being
built and enabled via defconfig.  Disable it in the defconfig, cleanup
the header.
Reviewed-by: NEric Nelson <eric@nelint.com>
Signed-off-by: NTom Rini <trini@konsulko.com>

configs/mx6memcal_defconfig

@@ -33,6 +33,7 @@ CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_SYS_MEMTEST_START=0x10000000
 CONFIG_SYS_MEMTEST_END=0x20000000
+# CONFIG_CMD_FUSE is not set
 # CONFIG_CMD_LOADB is not set
 # CONFIG_CMD_LOADS is not set
 CONFIG_CMD_CACHE=y

include/configs/mx6memcal.h

@@ -13,11 +13,6 @@
 #include "mx6_common.h"
 #include "imx6_spl.h"
 
-#undef CONFIG_MMC
-#undef CONFIG_SPL_MMC_SUPPORT
-#undef CONFIG_GENERIC_MMC
-#undef CONFIG_CMD_FUSE
-
 #define CONFIG_SYS_MALLOC_LEN		(64 * 1024 * 1024)
 
 #define CONFIG_MXC_UART