arm: Fix bad memcpy.S str8w macro argument count

Remove the extra (empty) argument passed to str8w, causing the following
error:

   <instantiation>:40:47: error: too many positional arguments
     str8w r0, r3, r4, r5, r6, r7, r8, r9, ip, , abort=19f
                                                 ^
   u-boot/arch/arm/lib/memcpy.S:240:5: note: while in macro instantiation
   17: forward_copy_shift pull=16 push=16
       ^

Note: no functional change intended.

Fixes: d8834a1323af ("arm: Use optimized memcpy and memset from linux")
Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
diff --git a/arch/arm/lib/memcpy.S b/arch/arm/lib/memcpy.S
index f7fb772..eee7a21 100644
--- a/arch/arm/lib/memcpy.S
+++ b/arch/arm/lib/memcpy.S
@@ -210,7 +210,7 @@
 		orr	r9, r9, ip, lspush #\push
 		mov	ip, ip, lspull #\pull
 		orr	ip, ip, lr, lspush #\push
-		str8w	r0, r3, r4, r5, r6, r7, r8, r9, ip, , abort=19f
+		str8w	r0, r3, r4, r5, r6, r7, r8, r9, ip, abort=19f
 		bge	12b
 	PLD(	cmn	r2, #96			)
 	PLD(	bge	13b			)