[][openwrt][mt7988][tops][remove tops]

[Description]
Remove tops driver and related kernel patches

The current release policy for tops is distribution via tarball.
As a result, the public version of the TOPS driver and related
kernel patches has been removed.

[Release-log]
N/A

Change-Id: I02c37ddb0822652b975a25e66f414614fa0d89b3
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8932728
78 files changed