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: Eric Nelson <eric@nelint.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/mx6memcal_defconfig b/configs/mx6memcal_defconfig
index 8b5e0ff..ed24b79 100644
--- a/configs/mx6memcal_defconfig
+++ b/configs/mx6memcal_defconfig
@@ -33,6 +33,7 @@
 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