meta-agl: introduce transmitter plugin to weston

meta-agl: introduce transmitter plugin to weston

The waltham-transmitter is the plugin of weston to enable client apps
to share its surface between multiple domains.

v2 (jsmoeller): rebased to new layer structure
v3 (jsmoeller): squashed with previous commit
v4 (jsmoeller): merge with https://gerrit.automotivelinux.org/gerrit/#/c/16187
                to keep addition together in one patch
v5 (jsmoeller): remove unneeded file
v6 (jsmoeller): merge with https://gerrit.automotivelinux.org/gerrit/#/c/17223/
                to keep addition together in one patch
                (cherry picked from commit d3ebc4bf2eb0331226ef4eac79aaacd520ee5a60)
v7 (jsmoeller): After discussions during the integration session:
                - fix hardcoded lib64 in source code
                - reduce package to just transmitter (render is part of the transmitter)
                - include waltham-transmitter in packagegroup (might not be final place)
v8 (tnaoko)   : add missing dependency plugins.

Change-Id: I7e607ed183f147fc0078bef54639207cfca80c6e
Signed-off-by: Wataru Mizuno <wmizuno@jp.adit-jv.com>
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Signed-off-by: Naoko Tanibata <tnaoko@jp.adit-jv.com>