wifi: rtw89: Fix rtw89_mac_power_switch() for USB

wifi: rtw89: Fix rtw89_mac_power_switch() for USB

[ Upstream commit e2b71603333a9dd73ee88347d8894fffc3456ac1 ]

Clear some bits in some registers in order to allow RTL8851BU to power
on. This is done both when powering on and when powering off because
that's what the vendor driver does.

Also tested with RTL8832BU and RTL8832CU.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/a39da939-d640-4486-ad38-f658f220afc8@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>