refactor(fvp): factor out interrupt information from the dts

The FVP_Base models are all identical. Individual components can be
swapped out without affecting the rest of the system. In order to not
diverge too much, factor as much common stuff out but leave out
interrupt information so that it can be swapped out.

Change-Id: I4ce5b627c7ca00d98f10eba888cc1bf4d61880a9
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/include/dt-bindings/interrupt-controller/arm-gic.h b/include/dt-bindings/interrupt-controller/arm-gic.h
index 803cd9c..c8eb69f 100644
--- a/include/dt-bindings/interrupt-controller/arm-gic.h
+++ b/include/dt-bindings/interrupt-controller/arm-gic.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2021, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019-2025, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -17,6 +17,7 @@
 #define GIC_PPI 1
 
 /*
+ * Only relevant for GIC <= v2
  * Interrupt specifier cell 2.
  * The flags in irq.h are valid, plus those below.
  */