[SWDEV-520665] Add support for board voltage (#303)

* Add the API and CLI to show the board voltage. 

---------

Change-Id: Icb25bd653bb1d004704b5a21b378ca31b2b242c7
Signed-off-by: Arif, Maisam <Maisam.Arif@amd.com>
Signed-off-by: AL Musaffar, Yazen <Yazen.ALMusaffar@amd.com>

tests/amd_smi_test/test_common.cc

@@ -123,6 +123,7 @@ static const char* short_options = "i:v:m:fr";
 
 static const std::map<uint32_t, std::string> kVoltSensorNameMap = {
     {AMDSMI_VOLT_TYPE_VDDGFX, "Vddgfx"},
+    {AMDSMI_VOLT_TYPE_VDDBOARD, "Vddboard"},
 };
 
 static void PrintHelp(void) {