misc: update nordic DFU function check

Internal with two kinds of reference devices;
One is the Nordic DFU/OTA supported and
the other is DFU/OTA not upported.

Add this DFU func to check device type to
adjust all test cases.

Change-Id: I2ae93fa05eff0e332fad30760efbdde5081f1bd8
Signed-off-by: Wei Tan <quic_weitan@quicinc.com>