drm/amdkfd: Update sysfs node properties for multi XCC

Update simd_count and array_count node properties to report
values multiplied by number of XCCs in the partition.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Tested-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>