Use (>= ${source:Version}) for interbetween versioning

Closes lintian error not-binnmuable-any-depends-all / not-binnmuable-all-depends-any

From: Michael Prokop <mprokop@sipwise.com>

debian/control

@@ -9,7 +9,7 @@ Homepage: http://sipwise.com/
 Package: ngcp-mediaproxy-ng-daemon
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Pre-Depends: ngcp-mediaproxy-ng-kernel-dkms (= ${binary:Version})
+Pre-Depends: ngcp-mediaproxy-ng-kernel-dkms (>= ${source:Version})
 Description: Proxy for RTP and media streams used in NGCP, userspace part.
  This daemon handles the first stages of proxying media streams and talks to
  the kernel part of the proxy for eventual high-performance packet forwarding.
@@ -22,7 +22,7 @@ Description: IPtables extension module for the kernel-space NGCP media proxy.
 
 Package: ngcp-mediaproxy-ng
 Architecture: all
-Depends: ngcp-mediaproxy-ng-daemon (= ${binary:Version}), ngcp-mediaproxy-ng-iptables (= ${binary:Version}), ngcp-mediaproxy-ng-kernel-dkms (= ${binary:Version})
+Depends: ngcp-mediaproxy-ng-daemon (>= ${source:Version}), ngcp-mediaproxy-ng-iptables (>= ${source:Version}), ngcp-mediaproxy-ng-kernel-dkms (>= ${source:Version})
 Description: NGCP RTP/media proxy - meta package.
  This is a meta package for easy installation of all three parts of the NGCP
  media proxy. It will install the user-space daemon, the kernel-space IPtables