ufs: Add UFS driver for Renesas R-Car X5H

ufs: Add UFS driver for Renesas R-Car X5H

Add UFS driver for UFS controller present on Renesas R-Car X5H R8A78000.
The controller uses different initialization code compared to previous
generation UFS controller present in Renesas R-Car S4 R8A779F0, and the
majority of the driver is the initialization, hence a new driver.

[Marek: Clean driver up, add SCMI reset handling, use read_poll_timeout(),
        pass error values out of ufs_renesas_pre_init(), change the
	compatible string to "renesas,r8a78000-ufs" to align with
	previous generation "renesas,r8a779f0-ufs"]

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Tuyen Dang <tuyen.dang.xa@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251028142335.18125-7-marek.vasut+renesas@mailbox.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>