ipa: use common ring event ring for WLAN MCC pipes in auto config

In IPA4.0 Auto configuration, all event rings are allocated for
different use cases and if we use different event rings for WLAN
MCC pipes event ring allocation fails resulting in WLAN enablement
failure. Make changes to use common event ring for WLAN MCC pipes.

Change-Id: I46a462a4ad1a9135b1fd28fbc627eb49017a11e3
Signed-off-by: Chaitanya Pratapa <cpratapa@codeaurora.org>