ARM: shmobile: defconfig: Refresh for v6.3-rc1

Refresh the defconfig for Renesas ARM systems:
  - Disable CONFIG_SERIAL_8250_PCI1XXXX (No Microchip 8250 based serial
    ports),
  - Enable RZ/N1 USB Function controller support.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/b4bac37273be5287b0198abe0aafd16f08ed330d.1678286291.git.geert+renesas@glider.be