msm: ecm_ipa: add support for power save

Add support for power save, specifically, add dependency between ECM_PROD
and APPS_CONS, which will wake up IPA when ECM_PROD is requested.

Change-Id: Icdfef9466f23922fd70df1653d02171c4a3ab0ca
Signed-off-by: Ravit Katzav <rkatzav@codeaurora.org>
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>