mtd: hyperbus: rpc-if: Add missing MODULE_DEVICE_TABLE

The rpc-if-hyperflash driver can be compiled as a module, but lacks
MODULE_DEVICE_TABLE() and will therefore not be loaded automatically.
Fix this.

Fixes: 5de15b61 ("mtd: hyperbus: add Renesas RPC-IF driver")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240731080846.257139-1-biju.das.jz@bp.renesas.com