ARM: OMAP: convert omap_device_build() and callers to __init

Building omap_devices should only be done at init time, and since
omap_device_build() is using early_platform calls which are also
__init, this ensures that omap_device isn't trying to use functions
that disappear.

Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 1881fe9..fb9b85b 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -28,7 +28,7 @@
 
 static struct omap_device_pm_latency *pm_lats;
 
-static int _init_omap_device(char *name)
+static int __init _init_omap_device(char *name)
 {
 	struct omap_hwmod *oh;
 	struct platform_device *pdev;