ARM: shmobile: defconfig: Refresh for v6.4-rc1

Refresh the defconfig for Renesas ARM systems:
  - Move CONFIG_PCI_RCAR_GEN2=y (moved in commit 81c362e7
    ("PCI: Sort controller Kconfig entries by vendor")),
  - Drop CONFIG_SERIAL_8250_PCI1XXXX=n (no longer auto-enabled since
    commit 5d943b5d ("serial: 8250_pci1xxxx: Disable
    SERIAL_8250_PCI1XXXX config by default")).
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/420669d925bf4a8527c80dd294568df3b0556058.1683705341.git.geert+renesas@glider.be

arch/arm/configs/shmobile_defconfig

@@ -36,8 +36,8 @@ CONFIG_NET_DSA=y
 CONFIG_CAN=y
 CONFIG_PCI=y
 CONFIG_PCI_MSI=y
-CONFIG_PCI_RCAR_GEN2=y
 CONFIG_PCIE_RCAR_HOST=y
+CONFIG_PCI_RCAR_GEN2=y
 CONFIG_DEVTMPFS=y
 CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_MTD=y
@@ -76,7 +76,6 @@ CONFIG_SERIAL_8250=y
 # CONFIG_SERIAL_8250_16550A_VARIANTS is not set
 CONFIG_SERIAL_8250_CONSOLE=y
 # CONFIG_SERIAL_8250_PCI is not set
-# CONFIG_SERIAL_8250_PCI1XXXX is not set
 CONFIG_SERIAL_8250_DW=y
 CONFIG_SERIAL_8250_EM=y
 # CONFIG_SERIAL_8250_PERICOM is not set