Add soc15 support and enable all the IPs for vega10.

v2: squash in xclk fix
v3: disable HDP MGCG
Acked-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NKen Wang <Qingqing.Wang@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>