drm/amdkfd: Make get_tile_config() generic

Given we can query all the asic specific information from amdgpu_gfx_config,
we can make get_tile_config() generic.

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