dt-util: Use bash in shebang line
dt-util: Use bash in shebang line

It contains a number of bashisms, causing it to fail
on Ubuntu where /bin/sh is dash.

Signed-off-by: Bob W. Hogg <c772a964fd55352a3510e5d535dd9ccc9ac30168@linux.com>

rwhogg/DomTerm,rwhogg/DomTerm,rwhogg/DomTerm,rwhogg/DomTerm,rwhogg/DomTerm,rwhogg/DomTerm