linux-testing: Update to version 3.19-rc5.

Using linux-testing for a bunch of machines, I'd actually expect it to
be more recent than the latest stable, but until now it actually was
behind.

Since torvalds/linux@464ed18ebdb6236fcff59d2a35d4d2e28, the option
PM_RUNTIME doesn't exist anymore, so we need to remove it from our
common config.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>