ramips: 5.15: add disabled PINCTRL_AW9523

ramips: 5.15: add disabled PINCTRL_AW9523

Otherwise kernel 5.15 will fail to build on subtargets except for mt7621
that has enabled the config.
The disabled PINCTRL_AW9523 config disappears after a refresh, it needs
to be added back manually.

Fixes: 675cf7557829 ("ramips: add config-5.15 for mt7620 subtarget")
Fixes: 001176994a58 ("ramips: add config-5.15 for mt76x8 subtarget")
Fixes: b9d9f33c330e ("ramips: add config-5.15 for rt288x subtarget")
Fixes: 0164dc0c2563 ("ramips: add config-5.15 for rt305x subtarget")
Fixes: ef59da866982 ("ramips: add config-5.15 for rt3883 subtarget")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>