make sure mep flag is set properly

when iccCardStatus arrives before iccslotStatus, euicc card object will
be created first with only one port, thus mep supprted flag is not set. when
later we received anther icccardstatus for the second port or received
iccSlotStatus, this mep flag is not updated in euicc port object.

Bug: 224634854
Test: Manual
Change-Id: I86c8cb94b0ddbde008a7ccba4a4471f2d1fcf132