Currently kernel configs and patches are applied only to linux-yocto.
Adding linux-raspberrypi_%.bbappend to apply openharmony kernel patches
also to linux-raspberrypi kernel.

Set linux-raspberrypi preferred kernel version to 5.10 to align with linux-yocto
version. This allows `driver-add-hilog-and-hievent-buffer-management-drive.patch`
to be correctly applied.

Signed-off-by: Francesco Pham <francesco.pham@huawei.com>