weston-ini-conf: Add agl-shell-grpc-server

weston-ini-conf: Add agl-shell-grpc-server

Now that we have gRPC server implementation start the agl-shell-grpc
server by default.

Change-Id: I1d00b29306f90ababc5277ecb71a101eea1a46ca
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/28364
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>