Make caffe2/fb folder compatible with AMD (#29131)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29131
caffe2_pb2.CUDA --> workspace.GpuDeviceType
workspace.NumCudaDevices() --> workspace.NumGpuDevices()
Also added the totalGlobalMem into get_device_properties(), which is needed by multi_gpu_utils.py
Test Plan:
sandcastle
f148921769
Reviewed By: bddppq
Differential Revision: D18290090
fbshipit-source-id: bde7c175d1fb6ff59a062266c1b17de39d113b24
