Change subprocess arguments in flashtool
Change subprocess arguments in flashtool

Previously, text=True was passed to subprocess in flashtool. This was
added in python3.7 as a more readable alias to universal_newlines.
Switch to the old name to support earlier python versions.

Change-Id: Ie95aa7d083a6d363f678e863fe7a077ead88a925
GitOrigin-RevId: e5a269c2273d46b6a0ba93db32462a9f40f37b0c

google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro