sh: missing symbol fix for sh4-202

This patch adds a plat_irq_setup() symbol for sh4-202. Without
this fix it is impossible to build a working kernel using the
microdev_defconfig.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4/setup-sh4-202.c

@@ -41,3 +41,8 @@ static int __init sh4202_devices_setup(void)
 				    ARRAY_SIZE(sh4202_devices));
 }
 __initcall(sh4202_devices_setup);
+
+void __init plat_irq_setup(void)
+{
+	/* do nothing - all IRL interrupts are handled by the board code */
+}