bsps/nios2: Address unused parameter warnings

Add "(void) param;" annotation to address unused parameter warnings.
Found with GCC's warning -Wunused-parameter.

bsps/nios2/nios2_iss/btimer/btimer.c

@@ -38,6 +38,8 @@ static rtems_interrupt_entry timer_interrupt;
 
 static rtems_isr timerisr(void *vector)
 {
+  (void) vector;
+
   TIMER_REGS->status = 0;
   Timer_interrupts++;
 }

bsps/nios2/nios2_iss/console/console.c

@@ -57,6 +57,8 @@ int console_inbyte_nonblocking(
   int port
 )
 {
+  (void) port;
+
   char ch;
 
   /*
@@ -75,6 +77,8 @@ void console_outbyte_polled(
   char ch
 )
 {
+  (void) port;
+
   altera_avalon_jtag_uart_regs *ajur = NIOS2_IO_BASE(JTAG_UART_BASE);
 
   /*