Remove IMAGE_BOOT_FILES and related WKS dependencies from ccimx93-dvk and
ccimx95-dvk machine configs. IMAGE_BOOT_FILES defines the files included
in the boot partition when creating WIC images. The removed files are
the Cortex-M demo firmware that we don't want on the boot partition of
our WIC image.
https://onedigi.atlassian.net/browse/DEL-9768
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
0e338f4b8f