asdk-libdrm

radeon: Fix 1D tiling layout on SI.

Very similar to Evergreen, but slightly different rules for tile / slice
alignment. Fortunately, these map quite naturally onto the previous fixes for
linear aligned layout on SI.

2D tiling still needs more work here and possibly in the kernel.

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>