[POWERPC] PS3: Save os-area params to device tree

Add the PS3 os-area startup params to the device tree.  This allows
a second stage kernel loaded with kexec to use these values.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/ps3/platform.h b/arch/powerpc/platforms/ps3/platform.h
index 6b4f4dd..01f0c95 100644
--- a/arch/powerpc/platforms/ps3/platform.h
+++ b/arch/powerpc/platforms/ps3/platform.h
@@ -63,6 +63,7 @@
 /* os area */
 
 void __init ps3_os_area_save_params(void);
+void __init ps3_os_area_init(void);
 u64 ps3_os_area_get_rtc_diff(void);
 void ps3_os_area_set_rtc_diff(u64 rtc_diff);