msm: ipa: Fix not to update state during pipe reset

When MHI pipes are disconnected, host doesn't expect any
further communication from device. Make a change to not
to update the state during pipe disconnect.

Change-Id: Ia2315e3a94049ba3adda4b42d363ce2f7108d89f
Signed-off-by: Chaitanya Pratapa <cpratapa@codeaurora.org>