drm/amdgpu: set MTYPE in PTE for GFXIP 9.4.3

drm/amdgpu: set MTYPE in PTE for GFXIP 9.4.3

Apply the GFXIP 9.4.3 specific snoop and mtype settings for various
scenarios such as APU, APU in Carveout mode and dGPU mode.

Note: This is expected to change due to:
1 - NPS > 1 support in future
2 - Hardware bugs found during initial asic bringup.

Cc: Graham Sider <graham.sider@amd.com>
Cc: Hawking Zhang <hawking.zhang@amd.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>