Refactor phy_led_trigger_register() and deduplicate its functionality
when registering LED trigger for link.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20201027182146.21355-1-andriy.shevchenko@linux.intel.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>