linux-dominion 3.15: update to 3.15.5

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
linux-dominion 3.15: enable IIO in Arietta G25 config

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Arietta G25: ship wifi kernel modules by default

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>