[TASK] Remove timestamp-openmac.c

- Remove the dynamic allocation of the sync-request timestamp variable
  in the DLL.
- Implement the sync-request timestamp variable directly in
  tDllkInstance.
- Remove unneeded functions from timestamp-openmac.c
- Rename EplTgtTimeStampDiffNs() to timestamp_calcTimeDiff()
- Move timestamp-openmac.c into hrtimer directory


Change-Id: I6b078c94b793d60d551ae6c2e5a0953d428f97e6
Reviewed-on: http://brateggevoat1/gerrit/1833
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Joerg Zelenka <joerg.zelenka@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[TASK] Cleanup Linux timestamp

- Rename EplTgtGetTimeStampNs() to target_getCurrentTimestamp()
- Adapt all references
- Move function from timestamp.c to target-linuxkernel.c
- Add declaration in target.h

Change-Id: I0c8a3ad637424ccedecd97f30aba2ba6cfd7ef8a
Reviewed-on: http://brateggevoat1/gerrit/1818
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Joerg Zelenka <joerg.zelenka@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[TASK] Adapt directory documentation to new directory structure

Change-Id: I69107418238e6dbe008ab1ce105d9e5f220542e7
Reviewed-on: http://brateggevoat1/gerrit/1812
Tested-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[FIX] Resolve warnings

Change-Id: I5238f8418cd1848d3b1228630a04f1c116c71b5c
Reviewed-on: http://brateggevoat1/gerrit/1778
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
Tested-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[TASK] Adapt and cleanup documentation for new build system

Change-Id: I042bbfb9638964c4838337a28193de3e77a4c033
Reviewed-on: http://brateggevoat1/gerrit/1817
Reviewed-by: Wolfgang Seiss <wolfgang.seiss@br-automation.com>
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>