bsps/irq: Add rtems_interrupt_get_attributes()

Add a default implementation which clears the attributes to zero and
just returns RTEMS_SUCCESSFUL for valid parameters.

Update #3269.

bsps/arm/beagle/irq/irq.c

@@ -95,6 +95,14 @@ static uint32_t omap_get_mir_reg(rtems_vector_number vector, uint32_t *const mas
   return mir_reg;
 }
 
+rtems_status_code bsp_interrupt_get_attributes(
+  rtems_vector_number         vector,
+  rtems_interrupt_attributes *attributes
+)
+{
+  return RTEMS_SUCCESSFUL;
+}
+
 rtems_status_code bsp_interrupt_raise(rtems_vector_number vector)
 {
   bsp_interrupt_assert(bsp_interrupt_is_valid_vector(vector));