[SWDEV-530633] Use gpu_metric speed and BW for xgmi (#366)

The xgmi command was showing pcie bit rate and bandwidth instead of xgmi. Corrected the API to get xgmi data from gpu metric.
Added python API for amdsmi_get_link_metrics. Modified the amdsmi_link_metrics struct.
Added check to confirm non zero partition got xgmi command.

---------

Signed-off-by: Bindhiya Kanangot Balakrishnan <Bindhiya.KanangotBalakrishnan@amd.com>
Signed-off-by: Maisam Arif <Maisam.Arif@amd.com>

[ROCm/amdsmi commit: 2eff0b3764]

projects/amdsmi/py-interface/amdsmi_wrapper.py

@@ -1153,8 +1153,6 @@ class struct__links(Structure):
 struct__links._pack_ = 1 # source:False
 struct__links._fields_ = [
     ('bdf', amdsmi_bdf_t),
-    ('bit_rate', ctypes.c_uint32),
-    ('max_bandwidth', ctypes.c_uint32),
     ('link_type', amdsmi_link_type_t),
     ('PADDING_0', ctypes.c_ubyte * 4),
     ('read', ctypes.c_uint64),
@@ -1165,6 +1163,8 @@ struct__links._fields_ = [
 struct_amdsmi_link_metrics_t._pack_ = 1 # source:False
 struct_amdsmi_link_metrics_t._fields_ = [
     ('num_links', ctypes.c_uint32),
+    ('bit_rate', ctypes.c_uint32),
+    ('max_bandwidth', ctypes.c_uint32),
     ('PADDING_0', ctypes.c_ubyte * 4),
     ('links', struct__links * 64),
     ('reserved', ctypes.c_uint64 * 7),