linux-phytec-fsl

MLK-11488-1 driver: char: sema4: add sema4 support

- add linux sema4 driver.
- use volatile types in sema4 structure.
- align the port definiton a9 is 1, m4 is 2.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Richard Zhu <r65037@freescale.com>