Patch: ath79: Move TPLink WPA8630Pv2 to tiny target

[Joseph Mullally]

https://github.com/openwrt/openwrt/pull/4500#issuecomment-1090822176

Old patch that may not be visible on the recent PRs.

> These devices only have 6MiB available for firmware,
> which is not enough for recent release images, so
> move these to the tiny target.

Tested by others and reviewed, should be ready for commit. Thanks in advance.