ARM: configs: u8500: Set NFC_SHDLC as built-in

ARM: configs: u8500: Set NFC_SHDLC as built-in

The CONFIG_NFC_SHDLC=m setting in u8500_defconfig causes a Kconfig
warning because the NFC_SHDLC symbol does not support being built
as a module.

Change the selection from 'm' to 'y' to build the driver in-kernel.

Fixes: 344cad0660ea0 ("ARM: configs: Update U8500 defconfig")
Signed-off-by: Jihed Chaibi <jihed.chaibi.dev@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250930122709.28987-1-linus.walleij@linaro.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>