staging: sm750fb: Prefer using BIT Macro

Replace bit shifting on 1 with the BIT(x) Macro
Problem found using checkpatch.pl
WARNING: 'Prefer using the BIT macro'

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>