pinctrl: equilibrium: Add request and free hooks

Add request and free gpio_chip hooks to support
gpio allocation and release in the driver.

Signed-off-by: Jack Ping CHNG <jchng@maxlinear.com>
Link: https://lore.kernel.org/20250627005419.3124660-1-jchng@maxlinear.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>