Add workarounds for 830/845's lack of a8/x8r8g8b8/x8b8g8r8 support.

When we have unset channels (color for a8, or alpha for x8*), force them
to the appropriate value in the texture combiner rather than relying on getting
the desired results from teture mapping.  Performance is the same on 865, so
multiple paths aren't necessary and we can use the less friendly texture
formats everywhere.

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