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: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>