Skip xf86HandleColormaps() at color depth 30. (v2)

The hardware gamma luts get bypassed at color
depth 30 anyway, so skip their setup.

v2: Also don't hook up drmmode_crtc_gamma_set()
    to .gamma_set for a screen with depth 30,
    so the server can spare itself the effort of
    updating and setting unused cluts.
    Suggested by Michel.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

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