ipq40xx: remove unnecessary execute permission bit

DTS files do not need to be executable. 644 is enough.

Fixes: 0fbdb51f7643 ("ipq40xx: add Edgecore OAP-100 support")
Signed-off-by: Sungbo Eo <[email protected]>
[split by targets]
Signed-off-by: Adrian Schmutzler <[email protected]>