net: cnss: add PM QoS support for dual WiFi

PM QoS adds support to improve the wlan throughput.
The cnss platform driver export PM QoS API to wlan
host driver.

Refactor PM QoS wrapper APIs to avoid the name space
collision in cnss platform driver compilation in dual WiFi
mode.

CRs-Fixed: 983653
Change-Id: Id7a486f2f111476e73d5707eba36611a3530e9cf
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>