iio: accel: mma9553: use GENMASK

Use GENMASK instead of BIT or direct value to
define a mask.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Suggested-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
1 file changed