Config.in: remove BR2_DEBIAN_MIRROR completely

Signed-off-by: Karoly Kasza <kaszak@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Config.in

@@ -220,16 +220,6 @@ config BR2_GNU_MIRROR
 	     http://ftp.gnu.org/pub/gnu
 	     http://mirror.aarnet.edu.au/pub/gnu
 
-config BR2_DEBIAN_MIRROR
-	string "Debian Software mirror"
-	default "http://ftp.debian.org"
-	help
-	  Debian has multiple software mirrors scattered around the world.
-	  The following allows you to select your preferred mirror.
-
-	  Usually, just add your country code like XX here:
-	  http://ftp.XX.debian.org
-
 endif
 
 config BR2_LUAROCKS_MIRROR