msm: ipa4: remove IPA_ENDP_INIT_CTRL_n.ENDP_SUSPEND usage

On IPA 4.0 HW there is no support for pipe suspend.
Instead corresponding GSI channel needs to be stopped.

Change-Id: I6cf3e6a5a52a88ddb3a2ab2380c741163ac555a1
CRs-Fixed: 2054613
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>