dtc: Switch to building and using our own dtc unless provided This makes us act like the Linux Kernel does and allow for dtc to be provided externally but otherwise we use the version of dtc that is included in the sources. This in turn means that we can drop the checkdtc logic. We select DTC in the cases where we will need the dtc tool provided. Signed-off-by: Tom Rini <trini@konsulko.com>
Travis-CI: Switch back to using the top of tree dtc In a0f3e3df4adc we switched to using the Ubuntu-provided dtc as travis was having a problem with the number of warnings that were generated by the newer dtc. This is no longer a concern as we now have the same logic as Linux to enable/disable additional more stringent warnings. Go back to building dtc from source. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org> Tested on travis-ci: Tested-by: Simon Glass <sjg@chromium.org>