phy: exynos5-usbdrd: use GENMASK and FIELD_PREP for Exynos5 PHY registers

phy: exynos5-usbdrd: use GENMASK and FIELD_PREP for Exynos5 PHY registers

Most Exynos850 and Exynos9 (GS101) DRD PHY registers use GENMASK for masks
and FIELD_PREP for writing values to registers.

Rewrite the register definitions which don't follow this approach to follow
it as much as possible. This patch doesn't introduce any fixes or
functional changes, it's merely an attempt to introduce some uniformity and
consistency in the driver code.

The CRPORT SuperSpeed control registers have been exempted from this
change. Since the writing of register values do not require any masking
operations, implementing it would unnecessarily complicate things.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Link: https://lore.kernel.org/r/20250410-exynos7870-usbphy-v2-1-2eb005987455@disroot.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>