ARC: memset: fix build with L1_CACHE_SHIFT != 6

In case of 'L1_CACHE_SHIFT != 6' we define dummy assembly macroses
PREALLOC_INSTR and PREFETCHW_INSTR without arguments. However
we pass arguments to them in code which cause build errors.
Fix that.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Cc: <stable@vger.kernel.org>    [5.0]
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/lib/memset-archs.S

@@ -30,10 +30,10 @@
 
 #else
 
-.macro PREALLOC_INSTR
+.macro PREALLOC_INSTR	reg, off
 .endm
 
-.macro PREFETCHW_INSTR
+.macro PREFETCHW_INSTR	reg, off
 .endm
 
 #endif