[][kernel][mt7988][eth][macsec: Remove CK_TOP_NETSYS_TOPS_400M_SEL since it's not relevant]

[Description]
Remove CK_TOP_NETSYS_TOPS_400M_SEL since it's not relevant.

[Release-log]
N/A

Change-Id: I7d3ec47e8daf64700d23050609d0b618c487e2e8
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8709047
3 files changed