meta-agl-bsp: meta-ti: add pvr systemd service

meta-agl-bsp: meta-ti: add pvr systemd service

dra7xx-evm currently does not initialize graphics correctly because
the PVR SGX services are not loaded at the correct time. Add a systemd
service which executes the script from the TI DDK before psplash and
weston are started. This fixes dra7xx-evm so that HomeScreen comes up
on boot.

Bug-AGL: SPEC-798

Change-Id: I0649902ac6066062527f345bea5e36e929d19c01
Signed-off-by: Matt Porter <mporter@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/10487
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Thomas Rini <trini@konsulko.com>
Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>