ARM: shmobile: 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/20200826093220.10266-3-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm/configs/shmobile_defconfig

@@ -37,7 +37,7 @@ CONFIG_CAN_RCAR=y
 CONFIG_PCI=y
 CONFIG_PCI_MSI=y
 CONFIG_PCI_RCAR_GEN2=y
-CONFIG_PCIE_RCAR=y
+CONFIG_PCIE_RCAR_HOST=y
 CONFIG_DEVTMPFS=y
 CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_SIMPLE_PM_BUS=y