soc: qcom: glink_loopback_server: Fix channel name of CDSP edge

Channel name of loopback server for CDSP edge is LOOPBACK_CTL_APPS.
Which is incorrect and this leads to remote side client not able to
connect to this server.

Channel name changed to LOOPBACK_CTL_APSS.

CRs-Fixed: 2144018
Change-Id: I54b29f2aee69fd686e3e24bce4c8e09565f39f6c
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>