This patch changes the samsung target to calculate the DTS file name
from vendor and device name and the SOC (i.e. subtarget) following
the common scheme:
soc_vendor_model.dts
This also updates the device definition name to make compatible,
image name, menuconfig name and DTS name consistent.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>