ARM: OMAP2+: Remove custom init_irq for remaining boards

With SoC specific timers, board specific init_irq is
no longer needed. Earlier this was still needed to
initialize the gptimer12 on Beagle based boards.

Also convert board-h4.c to use omap2_init_irq accidentally
did not get converted earlier.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/board-devkit8000.c b/arch/arm/mach-omap2/board-devkit8000.c
index 4b1f6c6..059b74d 100644
--- a/arch/arm/mach-omap2/board-devkit8000.c
+++ b/arch/arm/mach-omap2/board-devkit8000.c
@@ -397,11 +397,6 @@
 	},
 };
 
-static void __init devkit8000_init_irq(void)
-{
-	omap3_init_irq();
-}
-
 #define OMAP_DM9000_BASE	0x2c000000
 
 static struct resource omap_dm9000_resources[] = {
@@ -665,7 +660,7 @@
 	.reserve	= omap_reserve,
 	.map_io		= omap3_map_io,
 	.init_early	= omap35xx_init_early,
-	.init_irq	= devkit8000_init_irq,
+	.init_irq	= omap3_init_irq,
 	.init_machine	= devkit8000_init,
 	.timer		= &omap3_secure_timer,
 MACHINE_END