[MIPS] u-boot.lds: Fix __got_start and __got_end

Ensure that __got_start points to top of the `.got', and __got_end points
to bottom as well, so that we never fail to count num_got_entries.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
diff --git a/board/tb0229/u-boot.lds b/board/tb0229/u-boot.lds
index 26d8c81..148f5e6 100644
--- a/board/tb0229/u-boot.lds
+++ b/board/tb0229/u-boot.lds
@@ -45,9 +45,11 @@
 
 	_gp = ALIGN(16);
 
-	__got_start = .;
-	.got  : { *(.got) }
-	__got_end = .;
+	.got : {
+	  __got_start = .;
+	  *(.got)
+	  __got_end = .;
+	}
 
 	.sdata  : { *(.sdata) }