drm/amdgpu: validate XCP topology counts before division

drm/amdgpu: validate XCP topology counts before division

In aqua_vanjaram_get_xcp_res_info(), max_res[i] can be zero.
When res_lt_xcp is true the code divides num_xcp by max_res[i],
causing a divide fault.

Skip the loop body for absent resources.

v2: Remove redundant checks (Lijo)

Signed-off-by: Asad Kamal <asad.kamal@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>