freedreno: set SWAP bit based on format
freedreno: set SWAP bit based on format

Really this should be set based on buffer format, not on color vs
depth/stencil.  Probably there should be more formats that set the bit
as we add support for more render target formats.

Signed-off-by: Rob Clark <6f78cdb10adbe0a7fbbf4098125a51f401c77a5f@freedesktop.org>

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