OpenGL: cleanup yuv2rgb (real xfb) workflow

We neither scale nor render from subimages, so we by using gl_Position, we don't have to generate _any_ vertices for this converting.

Also remove the glTexSubImage optimization as every driver does it when needed. But there are some workflows (eg on APU) where it's better to realloc this texture instead of a second memcpy or stall.

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