build: mips: add default compilation options

MIPS targets should be compiled with no position independent code
allowed, as the generated image often does not support short range
components reference.

BUG=chrome-os-partner:31438
TEST=with the rest of the patches included MIPS board urara builds
     successfully

Change-Id: I8ac2a2f6979d3b468159c9e29d07e022f48ab18a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: e932b203db3e7cb510a7bf862d4538d55b6c7271
Original-Change-Id: I637dd44eb565447c18b2c3cdb022d0933c52fd20
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/215677
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8822
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/xcompile/xcompile

@@ -144,6 +144,10 @@ detect_special_flags() {
 		# specify -mmsse, etc flags.
 		CFLAGS="$CFLAGS  -march=i686"
 		;;
+	mipsel)
+		testcc "$CC" "$CFLAGS -mno-abicalls -fno-pic" && \
+                  CFLAGS+=" -mno-abicalls -fno-pic"
+		;;
 	esac
 }