Added analog IO test to ltp @bit@ testsuite (refs #34386)

* Needed for Sanvito ( with external expansion board)
* Merges linux-mx:r8376, linux-mx:r8377, linux-mx:r8378,
         linux-mx:r8379, linux-mx:r8380
** some clean-up
** changed error tolerance from percent to absolute value
   due to accuracy issues with values close to 0.
** fixed @aio@ parameters for new absolute error tolerance

* Fixed include path in rocko, needed because of changed ltp base version

Change-Id: I0aa09a81701b2bfab7e771bf6191c0dc701bae85
Reviewed-on: http://gfweb/gerrit/487