meta-agl-bsp: meta-ti: add dra7xx-evm weston.ini support

meta-agl-bsp: meta-ti: add dra7xx-evm weston.ini support

The change in commit 7d1d7457ff2b71abe95525b26148d5a3e7a42790
to dynamically generate weston.ini in the weston-ini-conf package
threw away the working weston.ini conf provided for dra7xx-evm.
This resulted in incorrect rotation of the image on the LCD since
dra7xx-evm builds were only picking up the default weston-ini-conf
.ini file contents for a generic HDMI display. Overriding the
output name with the correct drm rendering device name fixes this
and the image is displayed again in portrait mode.

Bug-AGL: SPEC-801

Change-Id: I52171dee27439667592481dac1ccd5284ed8206c
Signed-off-by: Matt Porter <mporter@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/10501
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: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>