libva provides some extra packages such as libva-glx.  Add PROVIDES
for them so the rest of the build system knows about it.

We also need to add the dependency relationships between libva,
libva-x11, and libva-glx.

Also remove the bogus RDEPENDS on the display components.

Also libva-glx depends on mesa-dri - if it's not there, libva-glx
won't be built.

Also, add missing -dev and -dbg packaging.

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>