[][kernel][mt7981][emmc][Fix the code format]

[Description]
Fix rootwait location, put it on the same line as "root".

[Release-log]
N/A

Change-Id: I4b099454b3d5ea1b45b252b81bf0f120787fbec9
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7251932
4 files changed