sh: Add support for R7780RP and R7780MP boards.

This adds support for the Renesas SH7780 development boards,
R7780RP and R7780MP.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/irq.h b/include/asm-sh/irq.h
index 611e67c..7e8455b 100644
--- a/include/asm-sh/irq.h
+++ b/include/asm-sh/irq.h
@@ -577,7 +577,7 @@
 #define NR_INTC2_IRQS	64
 #elif defined(CONFIG_CPU_SUBTYPE_SH7780)
 #define INTC2_BASE	0xffd40000
-#define INTC2_FIRST_IRQ	22
+#define INTC2_FIRST_IRQ	21
 #define INTC2_INTMSK_OFFSET	(0x38)
 #define INTC2_INTMSKCLR_OFFSET	(0x3c)
 #define NR_INTC2_IRQS	60