The DTS files in files-4.19 and files-5.4 are exactly identical
except for one file (qcom-ipq4018-emr3500.dts), which is only
present for 5.4.
Since there is no point in maintaining all these identical files
twice, this patch moves them to the "files" directory.
If there ever was a new kernel with substantial DTS changes, a
new folder would need to be introduced anyway and could easily be
done.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>