gallium: Split out PIPE_CAP_TEXTURE_MIRROR_CLAMP_TO_EDGE.
Some hardware can do PIPE_TEX_WRAP_MIRROR_REPEAT but not PIPE_TEX_WRAP_MIRROR_CLAMP and PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER. Drivers for such hardware would like to advertise support for ARB_texture_mirror_clamp_to_edge but not EXT_texture_mirror_clamp. This commit adds a new PIPE_CAP_TEXTURE_MIRROR_CLAMP_TO_EDGE bit, changes the extension enable to be based on that, and enables it in all upstream drivers which supported PIPE_CAP_TEXTURE_MIRROR_CLAMP (so they continue supporting this mode).
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