Verify PNOR Update: fix None pflash_cmd value
Verify PNOR Update: fix None pflash_cmd value

Fixed an error where pflash_cmd value is set to None if pflash doesn't
support skip parm.

Change-Id: I45821d894daaf460e0e944bf1065c65645159769
Signed-off-by: Michael Walsh <10404802c7de463f402c4a18638106ca1b12ef61@us.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation