omap1: Add initcall checks for omap1 and booted board

Otherwise multi-omap1 configurations will fail.

Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/pm.c

@@ -661,6 +661,9 @@ static int __init omap_pm_init(void)
 	int error;
 #endif
 
+	if (!cpu_class_is_omap1())
+		return -ENODEV;
+
 	printk("Power Management for TI OMAP.\n");
 
 	/*