[POWERPC] iSeries: Localise and constify some iSeries data

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/iseries/naca.h b/arch/powerpc/platforms/iseries/naca.h
index ab2372e..f01708e 100644
--- a/arch/powerpc/platforms/iseries/naca.h
+++ b/arch/powerpc/platforms/iseries/naca.h
@@ -14,7 +14,7 @@
 
 struct naca_struct {
 	/* Kernel only data - undefined for user space */
-	void *xItVpdAreas;              /* VPD Data                  0x00 */
+	const void *xItVpdAreas;	/* VPD Data                  0x00 */
 	void *xRamDisk;                 /* iSeries ramdisk           0x08 */
 	u64   xRamDiskSize;		/* In pages                  0x10 */
 };