soc: samsung: Add Exynos PMU driver

Add basic Power Management Unit (PMU) driver for Exynos SoCs. For now
it's only capable of changing UART path in PMU, which is needed for
E850-96 board. The driver's structure resembles the exynos-pmu driver
from Linux kernel, and although it's very basic and slim at the moment,
it can be easily extended in future if the need arises.

UCLASS_NOP is used, as there are no benefits in using more elaborate
classes like UCLASS_MISC in this case. The DM_FLAG_PROBE_AFTER_BIND flag
is added in bind function, as the probe function must be always called
for this driver.

Signed-off-by: Sam Protsenko <[email protected]>
Reviewed-by: Chanho Park <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>

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