msm: ipa: change max clients to 32 in ipa pm

Increase the maximum supported clients in ipa pm to 32.

Change-Id: I37f1c22f250ddc8f34b9dcd7c691e0db548d1037
Acked-by: Shihuan Liu <shihuanl@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>