mmc: sdhci-sirf: Remove non needed #ifdef CONFIG_PM* for dev_pm_ops

The SIMPLE_DEV_PM_OPS macro deals with the CONFIG_PM options when
assigning the PM callbacks, thus it's not needed to control this when
using the macro. By removing the non needed #ifdef, the code becomes a
bit cleaner.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>