drm/ci: add subset-1-gfx to LAVA_TAGS and adjust shards

The Collabora Lava farm added a tag called `subset-1-gfx` to half of
devices the graphics community use.

Lets use this tag so we don't occupy all the resources.

This is particular important because Mesa3D shares the resources with
DRM-CI and use them to do pre-merge tests, so it can block developers
from getting their patches merged.

Signed-off-by: Helen Koike <[email protected]>
Reviewed-by: David Heidelberg <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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