Use Architecture all for ngcp-mediaproxy-ng package

The package just depends on the other ones and doesn't provide
any architecture specific files.

From: Michael Prokop <mprokop@sipwise.com>

debian/control

@@ -21,7 +21,7 @@ Description: IPtables extension module for the kernel-space NGCP media proxy.
  Provides the IPtables extension needed to configure the mediaproxy rule.
 
 Package: ngcp-mediaproxy-ng
-Architecture: any
+Architecture: all
 Depends: ngcp-mediaproxy-ng-daemon, ngcp-mediaproxy-ng-iptables, ngcp-mediaproxy-ng-kernel-dkms
 Description: NGCP RTP/media proxy - meta package.
  This is a meta package for easy installation of all three parts of the NGCP