net: cnss: refactor PM QoS request wrapper API

Make PM QoS request API generic to pass the type of latency
requirement needed by the client instead of hard coding
latency type. Add latency type as a function parameter.

CRs-Fixed: 972761
Change-Id: Ic912148d2068fe8a758b6a4b3be570ccf870f03a
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>