egl/gbm: Remove duplicate format table

egl/gbm: Remove duplicate format table

Now that we have mask/channel information in gbm_dri's format conversion
table, we can remove the copy in EGL.

As this table contains more formats (notably including R8 and RG8, which
can be used for BO but not surface allocation), we now compare the masks
of all channels when trying to find a suitable config. Without doing
this, an XRGB8888 EGLConfig would match on an R8 format.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Ilia Mirkin <imirkin@alum.mit.edu>