MIPS: Introduce --gc-sections for MIPS

All architectures but MIPS are using --gc-sections on final linking.
This patch introduces that feature for MIPS to reduce the memory and
flash footprint.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Thomas Lange <thomas@corelatus.se>
Cc: Vlad Lungu <vlad.lungu@windriver.com>
Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>
diff --git a/board/gth2/u-boot.lds b/board/gth2/u-boot.lds
index aeb0fcc..9fc417f 100644
--- a/board/gth2/u-boot.lds
+++ b/board/gth2/u-boot.lds
@@ -34,14 +34,14 @@
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -52,7 +52,7 @@
 	  __got_end = .;
 	}
 
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	.u_boot_cmd : {
 	  __u_boot_cmd_start = .;
@@ -64,7 +64,7 @@
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss (NOLOAD)  : { *(.sbss) }
-	.bss (NOLOAD)  : { *(.bss) . = ALIGN(4); }
+	.sbss (NOLOAD)  : { *(.sbss*) }
+	.bss (NOLOAD)  : { *(.bss*) . = ALIGN(4); }
 	uboot_end = .;
 }