The target sectxfile_nl, which is an auto-generated newline file,
has dependencies on itself and the other files. The dependencies
should be on the other files and this newline file, not the other
way around. Ideally, the *_contexts recipes should have the
dependency recorded for their "contexts" files and the newline
file.

Additionally, recipe dependencies for building the *_contexts files
depended on the list of all the contexts files with the newline file
in that list, however an additional explicit addition of the newline
file was also added in. Remove this, since its in the full list of
files.

Change-Id: Iac658923f23a8d9263d392c44003b6bda4064646
Signed-off-by: William Roberts <william.c.roberts@intel.com>