Stop installing the LAVA test shell, it is no longer used for tests.

Signed-off-by: Dmitry Baryshkov <[email protected]>

Lava-test-shell is no longer used for tests, the repo is long gone, drop
the recipe from the layer.

Signed-off-by: Dmitry Baryshkov <[email protected]>

We no longer use the git version of mesa recipe, so drop it from the
repo. If at any point there is a need to build git version, it should be
done using devupstream class.

Signed-off-by: Dmitry Baryshkov <[email protected]>

Drop the qcom-x11 image, it is no longer used for any kind of testing.

Signed-off-by: Dmitry Baryshkov <[email protected]>

The xserver-xorg in OE-Core enables dri3 and glamor if OpenGL is to be
enabled since 2017 (commit 33864ddc1ca5 ("xserver-xorg: Enable glamor by
default")). Drop distro-specific override.

Signed-off-by: Dmitry Baryshkov <[email protected]>

This configfile was only used for musl setups, it has been removed in
OE-Core in 2017, when musl got support for lazy loading. Drop the config
file and override from meta-qcom (like we should have done ages ago).

Signed-off-by: Dmitry Baryshkov <[email protected]>

Two bbappends for meta-linux-mainline only select the defconfigs used to
build these kernels. Drop them to simplify the layer. If required,
corresponding settigns can be performed in a more effective way from
machine config files.

Signed-off-by: Dmitry Baryshkov <[email protected]>

The only remaining file in firmware-qcom-dragonboard845c is the Renesas
xHCI firmware, which is not requried normally (it is flashed into the
on-board ROM). Also it has questionable licensing status. Drop it from
the layer.

Signed-off-by: Dmitry Baryshkov <[email protected]>