[ARM] pxa: Fix PXA27x suspend type validation, remove pxa_pm_prepare()

pxa_pm_prepare() tried to validate the suspend method type.  As
noted in previous commits:
	eb9289eb20df6b54214c45ac7c6bf5179a149026
	9c372d06ce9ddf65e1393f9ea22a6d6bd5f96b42
	e8c9c502690efd24b7055bf608e7a3c34216848b

the checking of the suspend type in the 'prepare' method is the
wrong place to do this; use the 'valid' method instead.  This
means that pxa_pm_prepare() can be entirely removed.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index be6ca7d..ac40fa5 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -123,17 +123,6 @@
 
 #ifdef CONFIG_PM
 
-int pxa_pm_prepare(suspend_state_t state)
-{
-	switch (state) {
-	case PM_SUSPEND_MEM:
-	case PM_SUSPEND_STANDBY:
-		return 0;
-	default:
-		return -EINVAL;
-	}
-}
-
 void pxa_cpu_pm_enter(suspend_state_t state)
 {
 	extern void pxa_cpu_standby(void);
@@ -163,10 +152,14 @@
 	}
 }
 
+static int pxa27x_pm_valid(suspend_state_t state)
+{
+	return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
+}
+
 static struct pm_ops pxa27x_pm_ops = {
-	.prepare	= pxa_pm_prepare,
 	.enter		= pxa_pm_enter,
-	.valid		= pm_valid_only_mem,
+	.valid		= pxa27x_pm_valid,
 };
 #endif