[][OpenWrt Dev][Fix pinmux for SPI1 (used as SPI-C)]

[Description]
Fix pin group for SPI1 (used as SPI-C)

[Release-log]
N/A

Change-Id: Ieaa6fe6af30e452fbe169db24b99d81c3c3abcef
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4586292
2 files changed