rpmsg: glink: Fix use after free of channel refcount

Channel reference count is used after free in case of channel
is not fully opened due to errors and SSR happens.

Remove the channel ID from glink LCID list for last reference to
avoid re-using the stale pointer from LCID list.

CRs-Fixed: 2272962
Change-Id: Ibe2627444d42ef12860bdec36f147b01128cdf11
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>