freedreno/a5xx: hack for r8g8b8a8_snorm

Blob won't render to this format, and sampling from it it uses the same
fmt value for r8g8b8_snorm and r8g8b8a8_snorm.  But this is what is what
blocks us from jumping from gl30/gles20 to gl31/gles30.  So a hack it
is!

Signed-off-by: Rob Clark <robdclark@gmail.com>
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