linux-yocto: Drop local 5.10 recipes in favour of upstream

oe-core now comes with this version already: 5.10. 5.10 in oniro was an
upgrade for dunfell but now that we move to newer layers, we can drop it
and use the latest in upstream.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>