Re: dtc: Improve -Odts output

So, like, the other day David Gibson mumbled:

This patch makes improvements to the way properties are printed when
in dtc is producing dts output.  
	- Characters which need escaping are now properly handled when
printing properties as strings
	- The heuristics for what format to use for a property are
improved so that 'compatible' properties will be displayed as
expected.
	- escapes.dts is altered to better demonstrate the changes,
and the string_escapes testcase is adjusted accordingly.

Signed-off-by: David Gibson <redacted>

Applied.

Thanks,
jdl