ufs: rcar-gen5: Use a unique U_BOOT_DRIVER name

ufs: rcar-gen5: Use a unique U_BOOT_DRIVER name

All instances of U_BOOT_DRIVER must be unique or we will have link time
failures. It is possible to enable both ufs-renesas-rcar.c and
ufs-renesas-rcar-gen5.c at the same time, so give
ufs-renesas-rcar-gen5.c a new unique U_BOOT_DRIVER name.

Fixes: 3351fe7ecc1a ("ufs: Add UFS driver for Renesas R-Car X5H")
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Link: https://patch.msgid.link/20251112211841.1428696-1-trini@konsulko.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>