[][dts: mt7981: Fix driving for SPIM]

[Description]
Fix driving for SPIM

[Release-Log]
N/A

Change-Id: I7b292cca512fb49cc3a6d64ddd3c92b036a34f4a
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5441069
4 files changed