frdm: fixed path and dependencies for extract_dts_includes.py

the existing Kbuild is missing the path and needed python script
has new dependencies on yaml package also split the long line shorter ones.

Change-Id: I34fdd2ff70b2d76b0e2af6f78f2980d20651b12d
Signed-off-by: Rishi Khare <rishi.khare@intel.com>