linux-imx

ARM: shmobile: defconfig: Drop useless SERIAL_8250_EXTENDED=y

SERIAL_8250_EXTENDED only serves as a guard for other Kconfig options,
none of which is enabled in shmobile_defconfig.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>