The rdc.h is modified for new discovery and grouping APIs.
The RdcGroupSettingsImpl.cc is added to implement the GPU group and
the field group management.
The RdcMetricFetcherImpl.cc is added to fetch the metrics from
rocm_smi_lib. Currently, only support power, memory, GPU utilization,
temperature, GPU clock, total device and device name.
A new example field_value_example.cc is added to demo how to record
the fields and retrieve data from cache.
Change-Id: I57acfa048fe9b3d848e2d441e768b3a63ccae3f8
Bill(Shuzhou) Liu
a5f063f8b3