phy: rockchip: naneng-combphy: Simplify init ops

phy: rockchip: naneng-combphy: Simplify init ops

The init ops for Rockchip COMBPHY driver is more complex than it needs
to be, e.g. declaring multiple init functions that only differ in the
error message.

Simplify the init ops based on code from the Linux mainline driver.

This change also ensure that errors returned from combphy_cfg() and
reset_deassert_bulk() is propertly propagated to the caller. No other
runtime change is expected with this simplication.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>