staging: olpc_dcon: Change bitshifts to BIT macro

checkpatch.pl reported the bitshifts (1<<x) as a style violation, so
change them to the BIT macro (BIT(x)).

Signed-off-by: Zebulon McCorkle <zebmccorkle@zeb.fun>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>