MIPS: remove OUTPUT_FORMAT from linker scripts

The OUTPUT_FORMAT command in linker scripts
was always misused due to some endianess and
toolchain problems.

Use GCC flags to ensure proper output format,
and get rid of the OUTPUT_FORMAT commands in
the board specific u-boot.lds files.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Xiangfu Liu <xiangfu@openmobilefree.net>
diff --git a/arch/mips/cpu/xburst/config.mk b/arch/mips/cpu/xburst/config.mk
index 1536746..cf5fa6a 100644
--- a/arch/mips/cpu/xburst/config.mk
+++ b/arch/mips/cpu/xburst/config.mk
@@ -21,5 +21,11 @@
 #
 
 PLATFORM_CPPFLAGS += -march=mips32
+PLATFORM_CPPFLAGS += -mabi=32 -DCONFIG_32BIT
+ifdef CONFIG_SYS_BIG_ENDIAN
+PLATFORM_LDFLAGS  += -m elf32btsmip
+else
+PLATFORM_LDFLAGS  += -m elf32ltsmip
+endif
 
 CONFIG_STANDALONE_LOAD_ADDR ?= 0x80200000 -T mips.lds