drm/amdgpu: switch to ih_init_register_offset for vega10

drm/amdgpu: switch to ih_init_register_offset for vega10

Initialize ih control registers offset through helper
function vega10_ih_init_register_offset.

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Dennis Li <Dennis.Li@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>