msm: IPA: reset GSI channel on wdi_disconnect

In WDI3, wlan host driver will provide initial credit only one time
for TX after wdi_connect, we cannot reset the GSI channel on
wdi_disable case, since we will lost the credit info. If SAP is enabled
but no client has been connected, the GSI state will be remained on
allocated state, GSI channel reset is still required/valid in this case.

Change-Id: I270849a00790a464ab47a7ab1cac995c0d7a550a
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>