[ARM] pxa: move pmu device back into mach-pxa/

Not tested and enabled on MMP at this moment, and since the IRQ
is different from mach-pxa, I'd prefer to move the PMU device
back into mach-pxa/. Will introduce the PMU device to MMP once
it's enabled and tested.

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

arch/arm/mach-pxa/pxa25x.c

@@ -322,6 +322,7 @@ void __init pxa26x_init_irq(void)
 
 static struct platform_device *pxa25x_devices[] __initdata = {
 	&pxa25x_device_udc,
+	&pxa_device_pmu,
 	&pxa_device_i2s,
 	&sa1100_device_rtc,
 	&pxa25x_device_ssp,