virtual texture lightmap crash due to pixel format r8Unorm_srgb in MacEditor

Currently r8Unorm_srgb is required by virtual texture lightmap, and the Metal RHI simply forbids r8Unorm_srgb on Mac platform. Since the latest MacOS 11.0+ have the support of r8Unorm_srgb, we should make r8Unorm_srgb available in MacOS 11.0+ and have a better warning instead of crash in previous OS.

enable virtual texture lightmap and build light in Mac editor.

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