msm: ipa: changes to suspend/disable for WDI 2

Adapt to latest changes to IPA micro-controller(IPA uC).

For pipe SUSPEND, IPA uC will fail in case
the pipe is not empty.

IPA driver needs to insure pipe is empty
and then issue a SUSPEND command.

For pipe DISABLE, pipe is already empty on SUSPEND,
IPA driver does not need to do ensure anything before
issuing a DISABLE command.

Change-Id: Ic0e65b671fc29583203986defada31e92065adfd
Acked-by: Mohammed Javid <mjavid@qti.qualcomm.com>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>