rtw88: 8723d: Add set_channel

Set MAC/BB/RF register according to specified channel. The function
rtw_set_channel_mac() is used to set MAC registers, but 8723D only need
some of them.

For channel 14, we need to set different CCK DFIR values, so restore the
values when channel 1 to 13 is selected.

Spur calibration is needed in channel 13 and 14, and we do notch if spur
is over threshold.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200504105010.10780-4-yhchuang@realtek.com