arch-mips.inc: Use -EB/-EL for denoting endianness

While -meb/-mel works it is not documented as supported and using -EL/-EB
also makes clang work without tweaking TUNE_CCARGS

Fixes
 mips-poky-linux-musl-clang: error: unknown argument: '-meb'

(From OE-Core rev: 3d4bbd917613968ef0a7059ec11cf236b290c43c)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/machine/include/mips/arch-mips.inc

@@ -8,7 +8,7 @@ DEFAULTTUNE ?= "mips"
 
 # Endianess
 TUNEVALID[bigendian] = "Enable big-endian mode"
-TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'bigendian', ' -meb', ' -mel', d)}"
+TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'bigendian', ' -EB', ' -EL', d)}"
 
 # ABI flags
 TUNEVALID[o32] = "MIPS o32 ABI"