phy: ti: gmii-sel: use features mask during init

Use features mask during PHYs initialization to simplify code.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Link: https://lore.kernel.org/r/20200828201943.29155-3-grygorii.strashko@ti.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>