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/shared/irq/irq-default.c

@@ -37,6 +37,14 @@
 
 #include <bsp/irq-generic.h>
 
+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));