msm: ipa4: IPA PM naming fixes

Change the max_clients from a define to part of the clients enum.
Change the function name set_perf_profile to set_throughput since
it only changes throughput and perf_profile has been deprecated.

Change-Id: I425f438001d5e0024c09cd822b3f813de2840361
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>