Now all is finally working. I've copied all the driver modules for the /net/usb and /net/wireless, /rtc, /i2c, /w1 and whole the /sound folder to the /usr/local/lib/modules/3.18.6_v7-piCore+/kernel folder and than via tce installed dummy kernel module net-usb-xxx. This updated all the modules.dep files. Than I've removed the dummy kernel manually and copied the modules.dep files to the /opt directory to have them in backup. Than as the first lines in the bootlocal.sh is copy of these files to the /lib directory which enables the added modules to be loaded. But the issue is than the loading of these modules, because they're not automatically loaded at startup and they need to be manually reloaded after the modules.dep files are copied.
The device-tree is in this case not working too.