drm/amd/pm: correct the gpu metrics version

For V1_0 and V1_1, they come with different size. Misuse may cause
out of memory access.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>