rtw88: coex: update the mechanism for A2DP + PAN

Update A2DP+PAN+WL mechanism for CPT(Coexistence Performance Test) to
enhance WL/BT performance at the environment that some specific AP are
existing.

Signed-off-by: Ching-Te Ku <ku920601@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/20201126021059.11981-4-pkshih@realtek.com