wifi: rt2x00: Remove unused rfval values

wifi: rt2x00: Remove unused rfval values

The intention here is not clear but as this was already tested and matches
vendor driver it's better not to change behavior even if it looks suspicious.
So just remove the unused values.

Coverity-ID: 1525307

Signed-off-by: Ariel Otilibili <ariel.otilibili-anieli@eurecom.fr>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
[kvalo@kernel.org: write commit message]
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20241221124445.1094460-2-ariel.otilibili-anieli@eurecom.fr