In the same spirit as 858f2f2ae6 (egl/dri2: ease srgb __DRIconfig
conditionals), let's merge dri_single_config and dri_double_config into
a single dri_config[2].
This moves the `if (double) dri_double_config else dri_single_config`
logic to `dri_config[double]`, reducing code duplication and making it
easier to read.
Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
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