Change log message to debug VTS DTBO verify issue

Patch is intended to debug the DTBO verify  issue more conveniently,
it is better to replace __overlay__ node with fragment@x node,
like this :
ufdt_verify_fragment():failed to verify overlay node _overlay_ to target interrupt-controller@0xb220000
instead by:
ufdt_verify_fragment():failed to verify fragment node fragment@17 target_node interrupt-controller@0xb220000

Signed-off-by: gumingtao <gumingtao1225@gmail.com>
Signed-off-by: gumingtao <gumingtao@xiaomi.com>
Change-Id: I3a1616c2ab795f5c962043f44d7e3c6fe85ecb72
1 file changed