spi/pl022: fix spi-pl022 pm enable at probe

amba drivers does not need to enable pm runtime at probe.
amba_probe already enables pm runtime.

This rids this warning in the ux500 boot log:
ssp-pl022 ssp0: Unbalanced pm_runtime_enable!
Signed-off-by: Michel JAOUEN <michel.jaouen@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/spi/spi-pl022.c

@@ -2053,7 +2053,6 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
 	printk(KERN_INFO "pl022: mapped registers from 0x%08x to %p\n",
 	       adev->res.start, pl022->virtbase);
 
-	pm_runtime_enable(dev);
 	pm_runtime_resume(dev);
 
 	pl022->clk = clk_get(&adev->dev, NULL);