dtc: update to 1.4.0 and update dynamic-symbols-fixup-support-patch

latest mainline u-boot complains for dtc's minimum version 1.4.0

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Merge pull request #10 from schnitzeltony/master-schnitzeltony

dtc: update to 1.4.0 and update dynamic-symbols-fixup-support-patch