rtw88: 8822c: fix lc calibration timing

Before this patch, we use value from 2 seconds ago to decide
whether we should do lc calibration.
Although this don't happen frequently, fix flow to the way it should be.

Fixes: 7ae7784e ("rtw88: 8822c: add LC calibration for RTL8822C")
Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210426013252.5665-3-pkshih@realtek.com