The kernel configuration option is now available on kernel 5.10 and
5.15, add it to the config for 5.15 too.
Fixes: 8dfe69cdfc ("kernel: update nvmem subsystem to the latest upstream")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Copy kernel config and patches from 5.10. Along with it
individual targets' config-default from 5.10 has been moved to
config-5.10.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
