[TASK] Add documentation for OBD module

- Add module documentation
- Add documentation for OD definition macros
- Add objdict.h files to the documentation

Change-Id: Ic34490d3882106c0d3d42e1e5f9fde5eaaa49c15
Reviewed-on: http://brateggevoat1/gerrit/1360
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Joerg Zelenka <joerg.zelenka@br-automation.com>
Reviewed-by: Wolfgang Seiss <wolfgang.seiss@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[TASK] Add inline macros to hostif library for Nios II target

Change-Id: Ie11e1979cddc97a579f915f4659651deeee5ef7a
Reviewed-on: http://brateggevoat1/gerrit/1316
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[FIX] Fix FPGA MN and CN platform documentation

- Add Qsys tool handling information
- Update path to demos
- Delete reference to readme.txt

Change-Id: I12cd53526ae5b0485aff3dfd021a0051f0cbc4ae
Reviewed-on: http://brateggevoat1/gerrit/1344
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[FIX] Change Nios II /f data cache line size to 4 byte

This fix minimizes the CPU stalls in case of data cache misses.

Change-Id: I94f534f1cc37edbd1ba9857ba03bde0088ef9a02
Reviewed-on: http://brateggevoat1/gerrit/1341
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[TASK] Add gitignore files to Xilinx demos

Change-Id: I39c0a5bd8a50d9e71b3d59d59ea33af0326cf70b
Reviewed-on: http://brateggevoat1/gerrit/1342
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>