An outdated 'mesa' bbappend on meta-st-stm32mp is making mesa package
fail to build, due to incorrect configure options.
mesa-22.0.0/meson.build:614:2: ERROR: Problem encountered: kmsro requires dri3 for X11 support
Override the build configuration in our layer until the bbappend gets
fixed in ST layer.
Signed-off-by: Javier Viguera <javier.viguera@digi.com>