This commit allows installing a custom reg_update_bits function for cases where
the hardware provides a mechanism to set or clear register bits without a
read/modify/write cycle. Such is the case with the Microchip ENCX24J600.
Signed-off-by: NJon Ringle <jringle@gridpoint.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>