[][pinctrl: mediatek: fix mt7986a uart iocfg offset]

[Description]
Fix wrong register setting in mt7986a uart1/uart2 iocfg
This patch corrected pinconfig feature of mt7986a uart1/uart2

[Release-log]
N/A

Change-Id: I9052694cb89a885e30a68117aea0b7afb7c3b18f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5644647
1 file changed