sh: Restore RTC IRQ setting for SH7763 setup.

This was accidentally dropped in the multiple vectors per irq conversion.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4a/setup-sh7763.c

@@ -23,6 +23,7 @@ static struct resource rtc_resources[] = {
 	},
 	[1] = {
 		/* Shared Period/Carry/Alarm IRQ */
+		.start  = 20,
 		.flags	= IORESOURCE_IRQ,
 	},
 };