[SWDEV-539845] Add support for board voltage (#92)

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

---------

Signed-off-by: Arif, Maisam <Maisam.Arif@amd.com>
Signed-off-by: Juan Castillo <juan.castillo@amd.com>
Co-authored-by: Liu, Shuzhou (Bill) <Shuzhou.Liu@amd.com>

include/rocm_smi/rocm_smi.h

@@ -522,9 +522,10 @@ typedef enum {
 typedef enum {
   RSMI_VOLT_TYPE_FIRST = 0,
 
-  RSMI_VOLT_TYPE_VDDGFX = RSMI_VOLT_TYPE_FIRST,  //!< Vddgfx GPU
-                                                 //!< voltage
-  RSMI_VOLT_TYPE_LAST = RSMI_VOLT_TYPE_VDDGFX,
+  RSMI_VOLT_TYPE_VDDGFX = RSMI_VOLT_TYPE_FIRST,  //!< Vddgfx GPU voltage
+  RSMI_VOLT_TYPE_VDDBOARD,                       //!< Voltage for VDDBOARD
+
+  RSMI_VOLT_TYPE_LAST = RSMI_VOLT_TYPE_VDDBOARD,
   RSMI_VOLT_TYPE_INVALID = 0xFFFFFFFF            //!< Invalid type
 } rsmi_voltage_type_t;