platform: msm: usb_bam: ack cons request only after ipa_resume

This changes the timing of the ack on consumer request to happen
only after the ipa_resume.
In ECM suspend scenarios customer was reporting a crash after resume
event was received. After further investigation the crash occurs due
unclocked access to IPA BAM, due to ack on cons request before
ipa_resume is called.

Change-Id: If6d32d64ab7c20e4545edf6bd3c35356144088c1
CRs-fixed:  522425
Signed-off-by: Lena Salman <esalman@codeaurora.org>