Add Android makefiles for tegra target
Tegra devices use the tegra-drm driver to pipe output from the nouveau GPU backend to to displays. To do this, both the tegra and nouveau mesa drivers need to be enabled:
BoardConfig.mk: BOARD_GPU_DRIVERS := tegra nouveau
device.mk:
PRODUCT_PROPERTY_OVERRIDES +=
ro.hardware.hwcomposer=drm
hwc.drm.device=/dev/dri/card1
gralloc.gbm.device=/dev/dri/renderD129
drm.gpu.vendor_name=tegra
This has already been merged in the downstream Android mesa fork: https://android-review.googlesource.com/c/platform/external/mesa3d/+/1310336