sysclk: add vmin calculation feature

Source/sys-clk/common/src/client/ipc.c

@@ -175,4 +175,9 @@ Result hocClkIpcUpdateEmcRegs()
 {
     u32 temp = 0;
     return serviceDispatchIn(&g_sysclkSrv, HocClkIpcCmd_UpdateEmcRegs, temp);
+}
+Result hocClkIpcCalculateGpuVmin()
+{
+    u32 temp = 0;
+    return serviceDispatchIn(&g_sysclkSrv, HocClkIpcCmd_CalculateGpuVmin, temp);
 }