wifi: rt2x00: set VGC gain for both chains of MT7620

stable inclusion
from stable-v5.10.150
commit 5aa0461d11806599cf3b42bea1a3e68656bd0dd2
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0XA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5aa0461d11806599cf3b42bea1a3e68656bd0dd2



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[ Upstream commit 0e09768c ]

Set bbp66 for all chains of the MT7620.

Reported-by: Serge Vasilugin <vasilugin@yandex.ru>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/29e161397e5c9d9399da0fe87d44458aa2b90a78.1663445157.git.daniel@makrotopia.org


Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>