CNSS driver controls the power on/off wlan device. because on CPE
platform the link/power status of RC<->USP may be still on when wlan
device is turning on/off, this may cause uncorrectable AER error on
DSP side, to avoid this issue DSP’s downstream link should be
disabled before power on/off wlan device, and re-enabled after wlan
power on, and also wait for link training of DSP<->WLAN to complete.

Change-Id: Iaca103850d5ffc717a2a8bc40d16358e03c0c9db
Signed-off-by: Harrison Meng <quic_hmeng@quicinc.com>