mesa: Don't put sRGB formats in the array format table.

mesa: Don't put sRGB formats in the array format table.

sRGB vs unorm was the only conflict case being guarded against in this
function.  Before the PIPE_FORMAT conversion, we always listed the
unorm before the sRGB in the enums, but PIPE_FORMAT_A8B8G8R8_SRGB
happens to be before _UNORM.  We always want the unorm result here.

Fixes: 807a800d8c3e ("mesa: Redefine MESA_FORMAT_* in terms of PIPE_FORMAT_*.")
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>