[MIPS] MTX1: Enable CONFIG_CROSSCOMPILE in defconfig.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/configs/mtx1_defconfig

@@ -3021,7 +3021,7 @@ CONFIG_MAGIC_SYSRQ=y
 # CONFIG_DEBUG_FS is not set
 # CONFIG_HEADERS_CHECK is not set
 # CONFIG_DEBUG_KERNEL is not set
-# CONFIG_CROSSCOMPILE is not set
+CONFIG_CROSSCOMPILE=y
 CONFIG_CMDLINE=""
 CONFIG_SYS_SUPPORTS_KGDB=y