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Exynos7870's DSIM has separate registers for LINK and DPHY status. This is in contrast to older variants in the driver which use a single register for both. Add a driver data flag which indicates that the device variant supports the legacy status register. Change the register read calls appropriately. Suggested-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org> Signed-off-by: Inki Dae <inki.dae@samsung.com>