image.mk: clean up redundant code related to DEVICE_DTS

It is used by a core build template, so the variable should be
initialized and added to DEVICE_VARS in the core.
Same for DEVICE_DTS_DIR

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2016-07-14 13:58:23 +02:00
parent 7ed215437c
commit 8e2764ce9b
11 changed files with 10 additions and 20 deletions