linux-testing: Update to version 4.2.0-rc2.

Upstream diff of changes can be found at:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/diff/?id=v4.2-rc2&id2=v4.2-rc1&dt=2



Not tested on my machine right now (well, it's "testing" after all), but
verified the SHA256 from two different connections.

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