r300g: only allow byteswapped formats on big endian

They cause regressions on little endian.

Fixes: 172bfdaa9e ("r300g: add support for PIPE_FORMAT_x8R8G8B8_*")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98869
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
(cherry picked from commit 66d1cb587ac7b24fb04f26d30e686c3991fc8885)
1 file changed