Enable open source GPU support

Enable open source GPU support for Mali Utgard GPUs (lima driver) and
Mali Midgard and Bifrost GPUs (panfrost driver).
The support is enabled by:
- enabling DRM kernel CONFIGs
- enabling lima, panfrost and kmsro in Mesa
- disabling the specific mali driver overrides in sunxi-mali.inc
To enable open source mainline graphics support just add the following
line in your local.conf:

MACHINEOVERRIDES .= ":use-mailine-graphics"

Please note that some machines may need a bigger CMA value to be able to
start Weston. To do that, add e.g. "cma=128M" to the kernel parameters.

Signed-off-by: Diego Rondini <diego.rondini@kynetics.com>

conf/machine/include/sunxi-mali-driver.inc

@@ -0,0 +1,15 @@
+PREFERRED_PROVIDER_virtual/mesa ?= "mesa-gl"
+PREFERRED_PROVIDER_virtual/libgl ?= "mesa-gl"
+PREFERRED_PROVIDER_virtual/libgles1 ?= "sunxi-mali"
+PREFERRED_PROVIDER_virtual/libgles2 ?= "sunxi-mali"
+PREFERRED_PROVIDER_virtual/egl ?= "sunxi-mali"
+
+PACKAGECONFIG_remove_pn-xserver-xorg = "${@bb.utils.contains('DISTRO_FEATURES', 'x11', 'glamor', '', d)}"
+
+XSERVER += "sunxi-mali \
+            sunxi-mali-dev"
+
+MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "\
+ kernel-module-mali \
+ kernel-module-mali-drm \
+  "