Revert "configure: Make default-configs/ independent"

This reverts commit cc583bd1d5f62a9f803c43ada024636b25117d22.

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
Makefile: Fix kconfig git submodule

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>