arm/imxrt: Address unused parameter warnings

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

bsps/arm/imxrt/console/console.c

@@ -276,6 +276,8 @@ static bool imxrt_lpuart_first_open(
   rtems_libio_open_close_args_t *args
 )
 {
+  (void) args;
+
 #ifdef BSP_CONSOLE_USE_INTERRUPTS
   rtems_status_code sc;
 #endif
@@ -312,6 +314,8 @@ static void imxrt_lpuart_last_close(
   rtems_libio_open_close_args_t *args
 )
 {
+  (void) args;
+
   imxrt_lpuart_context *ctx = imxrt_lpuart_get_context(base);
 
   LPUART_Deinit((LPUART_Type *)ctx->regs);
@@ -446,6 +450,10 @@ rtems_status_code console_initialize(
   void *arg
 )
 {
+  (void) major;
+  (void) minor;
+  (void) arg;
+
   const void *fdt;
   int stdout_node;
   int node;

bsps/arm/imxrt/spi/imxrt-lpspi.c

@@ -272,6 +272,8 @@ static void imxrt_lpspi_next_rx_msg(
   volatile LPSPI_Type *regs
 )
 {
+  (void) regs;
+
   if (bus->rx_msg_todo > 0) {
     const spi_ioc_transfer *msg;
 

bsps/arm/imxrt/start/bspstart.c

@@ -134,6 +134,7 @@ rtems_vector_number imx_get_irq_of_node(
 
 uint32_t bsp_fdt_map_intr(const uint32_t *intr, size_t icells)
 {
+  (void) icells;
   return intr[0];
 }