msm: ipa: rm: add support for power save

Adds support for power save feature in IPA Resource Manager.
Manages IPA clock gating from the resource manager.
Adds a new APPS_CONS entity, PRODs which send data to A7 are
dependent on this APPS_CONS for waking up the IPA.

Change-Id: I702e75c0fdef1a919ad7836fd74890b263744b97
Signed-off-by: Ravit Katzav <rkatzav@codeaurora.org>
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>