irqchip: Add Aspeed SCU interrupt controller

The Aspeed SOCs provide some interrupts through the System Control
Unit registers. Add an interrupt controller that provides these
interrupts to the system.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/1579123790-6894-3-git-send-email-eajames@linux.ibm.com
diff --git a/MAINTAINERS b/MAINTAINERS
index f9f6e40..ac21e7b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2697,6 +2697,7 @@
 L:	linux-aspeed@lists.ozlabs.org (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2xxx-scu-ic.txt
+F:	drivers/irqchip/irq-aspeed-scu-ic.c
 F:	include/dt-bindings/interrupt-controller/aspeed-scu-ic.h
 
 ASPEED VIDEO ENGINE DRIVER