debian/control: remove unnecessary greater-than versioned dependencies

debian/control: remove unnecessary greater-than versioned dependencies

This fixes the following cme warnings:

Warning in 'source Build-Depends:1' value 'dpkg-dev (>= 1.16.1~)': unnecessary greater-than versioned dependency: dpkg-dev (>= 1.16.1~). Debian has oldoldstable -> 1.16.18; oldstable-kfreebsd -> 1.17.25; oldstable -> 1.17.27; stable -> 1.18.24; unstable -> 1.19.0.4; testing -> 1.19.0.5; unstable -> 1.19.0.5;
Warning in 'binary:"libam7xxx0.1" Recommends:2' value 'usb-modeswitch-data (>= 20111023-1)': unnecessary greater-than versioned dependency: usb-modeswitch-data (>= 20111023-1). Debian has oldoldstable -> 20120815-2; oldstable -> 20150115-1; oldstable-kfreebsd -> 20150115-1; jessie-backports -> 20170120-1~bpo8+1; stable -> 20170120-1; unstable -> 20170806-2; testing -> 20170806-2;