fdto: fix VtsFirmwareDtboVerification error [1/1]

PD#SWPL-158689

Problem:
VtsFirmwareDtboVerification 1 fail
failed to verify overlay node

Solution:
Enable fdt overlay
porting form 2019

Verify:
s7

Change-Id: Ia4f65fc8791ab555819f2abe365bc31de34f48f6
Signed-off-by: Bo Lv <bo.lv@amlogic.com>
13 files changed