Readme updated
Readme updated

* mostly 80 characters per line
* removed superfluous information coming from the TSN demo Readme
* updated standalone build instructions

Signed-off-by: Vladimir Oltean <5de9e48a5bf29460da1da501cff4d3f84e7164b8@freescale.com>

openil/sja1105-tool,openil/sja1105-tool