drm/amdgpu: update the handle ptr in early_init

update the handle ptr to amdgpu_ip_block ptr
for all functions pointers on early_init.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>