pinctrl: airoha: convert PHY LED GPIO to macro

PHY LED GPIO pinctrl struct definition is very similar across the
different 4 PHY and 2 LED and it can be generelized to a macro.

To reduce code size, convert them to a common macro.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: Ansuel