drm/amdgpu/pp: endian fixes for process_pptables_v1_0.c

Properly swap when reading from the vbios.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>