ARM: arm920/s3c24xx: IRQ demulitplexer callback

This patch adds a IRQ demultiplexer callback to the arm920 cpu core code,
plus a stub implementation of it for the S3C2410.

The purpose is to allow arm920t implementations such as the s3c24x0 to
implement interrupt handlers in u-boot without having to touch core
arm920t code.

Signed-off-by: Harald Welte <laforge@openmoko.org>
diff --git a/include/common.h b/include/common.h
index 54083f1..c4ee3e2 100644
--- a/include/common.h
+++ b/include/common.h
@@ -479,6 +479,8 @@
 ulong	get_PCI_freq (void);
 #endif
 #if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410) || defined(CONFIG_LH7A40X)
+void	s3c2410_irq(void);
+#define ARM920_IRQ_CALLBACK s3c2410_irq
 ulong	get_FCLK (void);
 ulong	get_HCLK (void);
 ulong	get_PCLK (void);