rpmsg: glink: Resource cleanup on glink smem probe fail

When glink smem probe fails before completion, allocated resources
are not freed properly before return.

Freeing up allocated resources before return, in case of glink smem
probe failure before completion.

CRs-Fixed: 2482441
Change-Id: Ia3834fe7a9555b4e4a9e225fe3002400523f0f1e
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>