u_format fixes
- Fix
util_format_srgb/linearto work with ETC2 formats - Fix
util_format_is_floatto return true forR11G11B10_FLOAT/R9G9B9E5_FLOATformats
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util_format_srgb/linear to work with ETC2 formatsutil_format_is_float to return true for R11G11B10_FLOAT/R9G9B9E5_FLOAT formats