mediatek: filogic: asus,rt-ax57m: remove unused pinctrl groups

mediatek: filogic: asus,rt-ax57m: remove unused pinctrl groups

Remove unused pinctrl groups defined in the device tree, probably as a
result of importing the vendor device tree which is based on the
reference board from MediaTek's SDK.

114b5c2063 ("mediatek: filogic: Add support ASUS RT-AX57M")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 96205c99d01cf7f5e69f03ccdea790d0eb9ddb36)
Signed-off-by: Garrett Mesmer <garrettmesm@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21237
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>