leon3,ngmp: cpucounter initialization use proper names

To be merged with "leon3,ngmp: simplify cpucounter initialization"

.. as an affect of previous patch, the next must be updated too.

c/src/lib/libbsp/sparc/leon3/startup/cpucounter.c

@@ -67,10 +67,11 @@ void leon3_cpu_counter_initialize(void)
     );
 
     /* Get and set the frequency */
-    rtems_counter_initialize_converter(ambapp_freq_get(&ambapp_plb, irqmp_dev));
+    rtems_counter_initialize_converter(
+      ambapp_freq_get(&ambapp_plb, LEON3_IrqCtrl_Adev));
   } else if (LEON3_Timer_Regs != NULL) {
       /* Fall back to the first GPTIMER if available */
-      freq = ambapp_freq_get(&ambapp_plb, timer_dev);
+      freq = ambapp_freq_get(&ambapp_plb, LEON3_Timer_Adev);
 
       gpt_counter_initialize(
         LEON3_Timer_Regs,