add kowalski kernel (M1 norh)

Change-Id: I9525c4d274a2bd9d5ef6aea67686903e94af49b4
use dalvik-heap config for 512Mb RAM devices

Change-Id: I4e5e7ab8ea27313f8564529bef644b67aa7a6ecd
merge device trees together (thanks @tonyp)

Change-Id: Ic3849b9b92da74297e6eed71c97e299c791eb7f8