kbuild, deb-pkg: fix generated package name

The binary package that make deb-pkg creates is a linux-image.
To be fixed may also be the addition of $DEB_ARCH.
Signed-off-by: maximilian attems <max@stro.at>
Signed-off-by: Frans Pop <elendil@planet.nl>
Cc: Andres Salomon <dilinger@debian.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/package/builddeb

@@ -36,7 +36,7 @@ else
 fi
 tmpdir="$objtree/debian/tmp"
 fwdir="$objtree/debian/fwtmp"
-packagename=linux-$version
+packagename=linux-image-$version
 fwpackagename=linux-firmware-image
 
 if [ "$ARCH" = "um" ] ; then