drm/amdgpu/gfx10: convert to IP version checking

Use IP versions rather than asic_type to differentiate
IP version specific features.

v2: rebase,  squash in navi10 fixes (Alex)
Acked-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>