drm/amdgpu: update IP count INFO query

update the query to return the number of functional
instances where there is more than an instance of the requested
type and for others continue to return one.

v2: count must reflect the actual number of engines (Alex)
v3: fix wrong number of engines for vcn (Alex)

Signed-off-by: Sathishkumar S <sathishkumar.sundararaju@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>