ipc: delete apr tal over glink

On kernel 4.14, apr uses rpmsg as an ipc interface
instead of glink. Delete apr_tal_glink source code.

Change-Id: I5e27942de6b837d6b992a1b93e85c742a6a30494
Signed-off-by: Shiv Maliyappanahalli <smaliyap@codeaurora.org>