Update ThunderG (P50X) board files to 2.6.38 compatible

Update the LG ThunderG (P50X series devices) board files
to be Linux 2.6.38 compatible

Change-Id: I3de57dcbfc2e500c7eae9ed43e6e1c2e644bb033
Signed-off-by: Rashed Abdel-Tawab <rashedabdeltawab@gmail.com>