apns: Update hollandsnieuwe's (NL) APN

Some time ago, hollandsnieuwe issued new SIM cards, which should
be associated with a different APN. This patch makes sure that we
support both the old and new ones.

Patch set 2: Add username and password (credits to Louis Matthijssen)

Change-Id: I21d0060825bc126b40990789c7552d6a3f0f6e43