Remove standard includes

These includes are not needed and fail the build when using a custom
built toolchain from OpenEmbedded.

Signed-off-by: Mathieu Anquetin <mathieu.anquetin@groupe-cahors.com>
Creating symlink to binary

Since the name of the flashable image is config-dependant, we create a
symlink to this file to have a standard name to the last built flashable
image.

Signed-off-by: Mathieu Anquetin <mathieu.anquetin@groupe-cahors.com>