ramips: ethernet: ralink: add fe_reset_fe() to reset fe via reset controller

ramips: ethernet: ralink: add fe_reset_fe() to reset fe via reset controller

The dts defines the reset fe for all architectures. However
the soc code used direct register access of the reset controller.
Replace the custom soc reset with a generic fe_reset_fe().

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>