microblaze: Remove code around r20 in relocate_code()

r20 is not used that's why remove logic around it.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/1b32bab5c050d099b2f6d49bc4896322ed03d788.1655299267.git.michal.simek@amd.com
diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index f2d6d12..c3d925c 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -310,11 +310,6 @@
 	bneid	r12, 3b
 	addik	r21. r21, 4
 
-	/* Update pointer to GOT */
-	mfs	r20, rpc
-	addik	r20, r20, _GLOBAL_OFFSET_TABLE_ + 8
-	addk	r20, r20, r23
-
 	/* Flush caches to ensure consistency */
 	addik	r5, r0, 0
 	addik	r6, r0, XILINX_DCACHE_BYTE_SIZE