Remove mips_attributes.

mips_attributes was introduced to work around clang problems with
-msoft-float. Those problems are now fixed and moreover .gnu_attributes
itself is unportable and creates problem with clang.

Revert "mips: Fix soft-float handling."

This partially reverts commit 6a4ecd276e.

grub-core/lib/mips/relocator_asm.S

@@ -17,13 +17,11 @@
  */
 
 #include <grub/symbol.h>
-#include <grub/cpu/kernel.h>
 	
 	.p2align	4	/* force 16-byte alignment */
 
 	.set noreorder
 	.set nomacro
-	mips_attributes
 
 VARIABLE (grub_relocator_forward_start)
 	move $a0, $9