scsi: ufs: renesas: Add register read to remove save/set/restore

scsi: ufs: renesas: Add register read to remove save/set/restore

Add support for returning read register values from
ufs_renesas_reg_control(), so ufs_renesas_set_phy() can use the existing
ufs_renesas_write_phy() helper.  Remove the now unused code to save to,
set, and restore from a static array inside ufs_renesas_reg_control().

Ported from Linux kernel commit
5129aa627599 ("scsi: ufs: renesas: Add register read to remove save/set/restore")

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/9fa240a9dc0308d6675138f8434eccb77f051650.1741179611.git.geert+renesas@glider.be
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>