mx6memcal: Remove SPL_USB_HOST

As this particular platform is intended to be loaded and run a specific
set of routines in SPL, we do not need the ability to further use the
USB as a host device in SPL.  Disable this support.

Cc: Eric Nelson <eric@nelint.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Eric Nelson <eric@nelint.com>
diff --git a/configs/mx6memcal_defconfig b/configs/mx6memcal_defconfig
index a1bc95b..021e8a6 100644
--- a/configs/mx6memcal_defconfig
+++ b/configs/mx6memcal_defconfig
@@ -16,7 +16,6 @@
 CONFIG_SYS_MEMTEST_END=0x20000000
 CONFIG_SUPPORT_RAW_INITRD=y
 CONFIG_SYS_SPL_MALLOC=y
-CONFIG_SPL_USB_HOST=y
 CONFIG_SPL_WATCHDOG=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_MAXARGS=32