layerscape: configure PHY reset GPIO on LS1012A-FRDM

layerscape: configure PHY reset GPIO on LS1012A-FRDM

On the LS1012A-FRDM both PHY reset pins are tied to GPIO1_23.
Up to Linux 6.6, pinctrl did not touch this GPIO and the reset
line remained in the state set by U-Boot. Starting from 6.12,
the kernel requires explicit configuration of this pin, otherwise
the PHYs fail to be detected.

This adds a gpio-hog node to ensure the reset line stays asserted,
fixing PHY detection on boot.

Signed-off-by: Pawel Dembicki <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20614
Signed-off-by: Christian Marangi <[email protected]>