Add support to invoke HIF runtime PM APIs in TX packet path based on
throughput level. Essentially at high throughputs, where runtime PM is
not expected to provide power gains, invoking the APIs is deterimental to
performance.
Hence invoke runtime_pm APIs based on throughput level.
CRs-Fixed: 3059712
Change-Id: I49d111bffa8a37c68abbdd54911f9ecc22430562
81e29163db