serial: dont restore cflag

Change-Id: I5ff91993f0cbb8afea244d52dea25d3df359fc0b
Merge branch '4AI1.7' into cm-10.1
Add kernel CFLAGS
3.0.51

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
3.0.52
3.0.53

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
3.0.54

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
3.0.55

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
3.0.56

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
3.0.57

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>