linux-testing: Update to version 3.19-rc7.

Running -rc6 always feels kinda rusty and old, so there is the pressing
urge to update... into the future... swooooooosh!

Signature verified against key with fingerprint:

ABAF 11C6 5A29 70B1 30AB  E3C4 79BE 3E43 0041 1886

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