staging: most: add spaces preferred around that '<<'

This patch adds space around '<<' found by checkpatch.

CHECK: spaces preferred around that '<<' (ctx:VxV)
FILE: drivers/staging/most/hdm-dim2/dim2_reg.h:69:
Signed-off-by: NChaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/hdm-dim2/dim2_reg.h

@@ -66,7 +66,7 @@ struct dim2_regs {
 	/* 0xF7 */ u32 ACMR1;
 };
 
-#define DIM2_MASK(n)  (~((~(u32)0)<<(n)))
+#define DIM2_MASK(n)  (~((~(u32)0) << (n)))
 
 enum {
 	MLBC0_MLBLK_BIT = 7,