[POWERPC] PS3: Remove unused os-area params

Updates for PS3 os-area startup params
o Remove some unused PS3 os-area startup params from struct saved_params.
o Rename ps3_os_area_init() to ps3_os_area_save_params().
o Zero mirrored header after saving params.

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/setup.c b/arch/powerpc/platforms/ps3/setup.c
index 609945d..f0d5ec5 100644
--- a/arch/powerpc/platforms/ps3/setup.c
+++ b/arch/powerpc/platforms/ps3/setup.c
@@ -228,7 +228,7 @@
 
 	powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE;
 
-	ps3_os_area_init();
+	ps3_os_area_save_params();
 	ps3_mm_init();
 	ps3_mm_vas_create(&htab_size);
 	ps3_hpte_init(htab_size);