phy: exynos5-usbdrd: Add Exynos850 support

Implement Exynos850 USB 2.0 DRD PHY controller support. Exynos850 has
quite a different PHY controller than Exynos5 compatible controllers,
but it's still possible to implement it on top of existing
exynos5-usbdrd driver infrastructure.

Only UTMI+ (USB 2.0) PHY interface is implemented, as Exynos850 doesn't
support USB 3.0.

Only two clocks are used for this controller:
  - phy: bus clock, used for PHY registers access
  - ref: PHY reference clock (OSCCLK)

Signed-off-by: Sam Protsenko <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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