meta-agl-bsp: Remove Raspberry Pi 720p over-ride

meta-agl-bsp: Remove Raspberry Pi 720p over-ride

Remove weston.ini config fragment over-ride to force 720p that has
been done for Raspberry Pi since scaling to screen size has been
dropped with the switch to the new compositor.  Raspberry Pi 4 is
capable of running at 1080p without the memory issues of the Pi 3,
so the scaling is not necessary for it, anyways.

Bug-AGL: SPEC-3455

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ib7cac877491cfe492fbc9a4ed49c4ff98f080667
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25038
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>