import: pru patch from https://github.com/beagleboard/kernel/commit/2c2a6c5c464efbfb3d8d0a9598041863f9b74c03

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
kernel bump: v3.12.7

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>