[ARM] pxa: register Power I2C device only when necessary

Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index 7c11669..7769718 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -324,7 +324,7 @@
 	local_irq_disable();
 	PCFR |= PCFR_PI2CEN;
 	local_irq_enable();
-	pxa27x_device_i2c_power.dev.platform_data = info;
+	pxa_register_device(&pxa27x_device_i2c_power, info);
 }
 
 static struct platform_device *devices[] __initdata = {
@@ -334,7 +334,6 @@
 	&pxa_device_stuart,
 	&pxa_device_i2s,
 	&pxa_device_rtc,
-	&pxa27x_device_i2c_power,
 	&pxa27x_device_ssp1,
 	&pxa27x_device_ssp2,
 	&pxa27x_device_ssp3,