vo_drm: support zimg, require zimg for 30 bit

This trivially enables use of zimg. You still need to use
--sws-allow-zimg to use it.

In addition, it removes the vo_drm-specific 30 bit RGB support, and uses
zimg's support for it. Like vo_drm, zimg's wrapper simply repacks from
GBRP to RGB30 in C, but it's still a worthy cleanup, as the zimg wrapper
need a concept of "packing" image output anyway. There also might be a
minor performance benefit due to doing the conversion slice-wise and
reducing cache thrashing (whether this positive effect really happens
with typical slice/image/cache sizes is unknown).

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