Fix build on gcc 4.7/4.8

Change-Id: Ib3d7831cd1994560a34c356f0bf8f86140b02b7d
linaro 4.8 fixes
Remove '+' symbol from kernel version string

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
Fix for GCC 4.8