radeon: fall back to 1D tiling only with broken kernels

Certain cards report the the wrong bank setup which causes
surface init to fail in the ddx and leads to no accel.
If we hit an invalid tiling parameter, just set a default
value and disable 2D tiling.

Should fix:
https://bugs.freedesktop.org/show_bug.cgi?id=43448



Signed-off-by: Alex Deucher <alexander.deucher@amd.com>