msm: ipa4: Enable SSR for IPAv4

Re-enable SSR. Move q6 ch halt from after shutdown to before
shutdown and remove consumer check for IPAv4 and beyond.

Change-Id: I9bcff8ad242f996160373d4b278833d02cad3fbb
CRs-fixed: 2203491
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>