Revert "resources.conf: EC20 doesn't support SupplementaryServices"

This reverts commit 31b7f0f9dea3f6f00230022a12612b6750018be6.

EC20 actually supports the feature. I was wrong mainly due to 2 reasons:
- I somehow failed to set the modem Online before checking for the
interface, and in that case it is not shown.
- The test I saw failing in prod is due to /gobi_0 being actually a
gobi2000 there, and the once failing was actually the gobi2000 and not
the EC20.

Change-Id: I31ad35b718e20168a75930498901015ca2015a52
1 file changed