qcacmn: Create QDF timer multiplier get/set APIs

In order to provide greater flexibility on emulation platforms, replace
the current hard-coded QDF_TIMER_MULTIPLIER with a pair of get/set
methods, configurable at runtime.

Change-Id: I0757da6c2129db08459411eaef75b6183f1aa557
CRs-Fixed: 2049309
3 files changed