msm: ipa4: halt both q6 channels for IPAv4

Add a flag in hal_q6_channel to halt both consumer and producer
channels. Halt both q6 channels starting from IPAv4.

Change-Id: I1f62e08d9709389fe52968bcbbf7d782786be1ab
Crs:fixed: 2203488
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>