ARM: multi_v7_defconfig: Enable CONFIG_PCIE_RCAR_HOST

config option PCIE_RCAR internally selects PCIE_RCAR_HOST which builds the
same driver. So this patch renames CONFIG_PCIE_RCAR to
CONFIG_PCIE_RCAR_HOST so that PCIE_RCAR can be safely dropped from Kconfig
file.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20200826093220.10266-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>