ARM: pxa/z2: fix building error of pxa27x_cpu_suspend() no longer available

Cc: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
diff --git a/arch/arm/mach-pxa/z2.c b/arch/arm/mach-pxa/z2.c
index 6c9275a..a82d420 100644
--- a/arch/arm/mach-pxa/z2.c
+++ b/arch/arm/mach-pxa/z2.c
@@ -686,7 +686,8 @@
 	 */
 	PSPR = 0x0;
 	local_irq_disable();
-	pxa27x_cpu_suspend(PWRMODE_DEEPSLEEP, PLAT_PHYS_OFFSET - PAGE_OFFSET);
+	pxa27x_set_pwrmode(PWRMODE_DEEPSLEEP);
+	pxa27x_cpu_pm_enter(PM_SUSPEND_MEM);
 }
 #else
 #define z2_power_off   NULL