gl: Separate viv direct texture checks from viv-fb winsys check
Vivante direct textures do not depend on the viv-fb windowing system. Decouple these two to be able to use direct textures even when viv-fb is not enabled.
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Vivante direct textures do not depend on the viv-fb windowing system. Decouple these two to be able to use direct textures even when viv-fb is not enabled.