drm/amd/pm: Correct reserved uint32_t number in beige_goby_PPTable

Correct reserved number according to the latest struct in drm-next

Signed-off-by: Chengming Gui <Jack.Gui@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>