On CPE platform, there is ntn3 pcie switch locates between RC and
Wlan, so the wlan pcie link is separated two parts, RC<->USP and
DSP<->WLAN, when pcie link suspend/resume, the link status of these
two buses is different, when link suspend the RC<->USP is not powered
off due to the existence of Ethernet device under same pcie switch.
For the case of cnss driver to power on/off wlan soc when pcie link
is still turned on, to avoid AER issue, before power on wlan soc cnss
driver needs to disable DSP<->WLAN link and then enable the link and
wait for link training completion Before powering off wlan soc cnss
driver also needs to disable DSP<->WLAN link at first. Function
msm_pcie_ntn3_dsp_link_control() is called by cnss driver to
enable(with link train)/disable DSP<->WLAN link when RC<->USP is on.

Change-Id: I8236b0786a14d6fb6c11805f24407edaa24e9836
Signed-off-by: Harrison Meng <quic_hmeng@quicinc.com>