[TASK] Remove PosixFileLinuxKernel.c

It is no longer used as obdcdc always runs in userspace with the new
stack architecture.

- Remove PosixFileLinuxKernel.c from Linux kernel driver CMake file
- Move PosixFileLinuxKernel.c and PosixFileLinuxKernel.h into staging
- Cleanup obdcdc.c

Change-Id: Id531c72be0c46438a28e84d05d52736982272a82
Reviewed-on: http://brateggevoat1/gerrit/1004
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[TASK] Update Linux X86 documentation

Change-Id: Ifcb899a894f8e17fcc0efaa8f5365aecf21e48b0
Reviewed-on: http://brateggevoat1/gerrit/1003
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
Tested-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[FEATURE] Rework DLL CAL module

- Add additional CAL implementations
- Change to use a single CAL implementation for all DLLCAL queues

Change-Id: I63d3d9defc8cbec0e081a979f32e894af94565b2
Reviewed-on: http://brateggevoat1/gerrit/999
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
Tested-by: Josef Baumgartner <josef.baumgartner@br-automation.com>