media-libs/mesa: Condense Intel VIDEO_CARDS options

VIDEO_CARDS has grown out of control in recent years, and the options
don't really make sense outside of a single package. For example,
VIDEO_CARDS=iris makes sense for Mesa, because it enables the Gen8+
Gallium OpenGL driver named Iris. VIDEO_CARDS=i965 makes sense as well
because it enables the Gen4-Gen11 classic OpenGL driver named i965.

But how these VIDEO_CARDS settings should extend to other packages was
never clearly defined. Until commit 564e4e3d1b14 ("x11-libs/libva: use
optfeatures instead of VIDEO_CARDS") pulled in drivers depending on the
VIDEO_CARD setting, but x11-libs/libva-intel-driver and
x11-libs/libva-intel-media-driver support only partially overlapping
sets of hardware, and neither correspond well to "i965" or "iris".

In truth, this level of flexibility (for example, the ability to build
only i965 but not the older i915, or iris but not crocus) isn't worth
the hassle and confusion it causes users. The insane marketing names of
GPUs also doesn't make the situation any clearer.

Signed-off-by: Matt Turner <mattst88@gentoo.org>

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