ufs: ufs-renesas: Add support for Renesas R-Car UFS controller

Add support for Renesas R-Car UFS controller which needs vendor-specific
initialization.

Ported from Linux kernel as of commit
c2ab666072bc ("scsi: ufs: Explicitly include correct DT includes")

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Tom Rini <trini@konsulko.com>