kernel: 5.10: add further generic kconfig symbols

This will make the specific kconfig smaller.

Reviewed-by: Tomasz Maciej Nowak <tmn505@gmail.com>
Tested-by: Tomasz Maciej Nowak <tmn505@gmail.com>
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
[improved commit title]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>