ARM: ux500: Correct Ux500 family names usage

Update users with cpu_is_ux540_family() to keep x540
family functional.

Signed-off-by: Loic Pallardy <loic.pallardy@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
index cb35897..a5dda684 100644
--- a/arch/arm/mach-ux500/platsmp.c
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -118,7 +118,7 @@
 {
 	void __iomem *backupram;
 
-	if (cpu_is_u8500_family())
+	if (cpu_is_u8500_family() || cpu_is_ux540_family())
 		backupram = __io_address(U8500_BACKUPRAM0_BASE);
 	else
 		ux500_unknown_soc();