msm: ipa3: halt modem channels as part of SSR

For modem SSR, APPS needs to halt modem consumer channels after
shutdown to make sure GSI FW does not access any modem's memory.

Change-Id: I6889a2ad509e0b1104ef8c3f65f24fe39b10745d
CRs-Fixed: 2008582
Acked-by: Ady Abrahan <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>