kernel: sort generic configuration

kernel: sort generic configuration

This was done by executing these commands:

$ ./scripts/kconfig.pl '+' target/linux/generic/config-5.10 /dev/null > target/linux/generic/config-5.10-new
$ mv target/linux/generic/config-5.10-new target/linux/generic/config-5.10

$ ./scripts/kconfig.pl '+' target/linux/generic/config-5.15 /dev/null > target/linux/generic/config-5.15-new
$ mv target/linux/generic/config-5.15-new target/linux/generic/config-5.15

Signed-off-by: Aleksander Jan Bajkowski <[email protected]>
Signed-off-by: Daniel Golle <[email protected]>