MIPS: factor out endianess flag handling to arch config.mk

This is CPU independent and should be configured architecture-wide.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/cpu/xburst/config.mk b/arch/mips/cpu/xburst/config.mk
index bce0c1b..18d49ab 100644
--- a/arch/mips/cpu/xburst/config.mk
+++ b/arch/mips/cpu/xburst/config.mk
@@ -20,5 +20,4 @@
 # MA 02111-1307 USA
 #
 
-PLATFORM_CPPFLAGS += -march=mips32 -EL
-PLATFORM_LDFLAGS += -EL
+PLATFORM_CPPFLAGS += -march=mips32