Drop unused members dev and base from struct rcar_pcie_host.

Link: https://lore.kernel.org/r/20201023162008.967-1-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: NLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>