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

Link: https://lore.kernel.org/r/20220603110524.1997825-5-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>