roms: remove redundant printf

we don't need this message here, because the final confirmation
at the end of main() says which targets were built. saying what
individual rom images were built is just needless bloat,
especially with the new simplified lbmk design; we no longer
provide lots of rom images with different keymaps, because we
now expect the user to insert a gkb file themselves with cbfstool.

Signed-off-by: Leah Rowe <leah@libreboot.org>

script/roms

@@ -184,7 +184,6 @@ add_seabios_payload()
 
 cprom()
 {
-	printf "Creating target image: %s\n" "$1"
 	x_ mkdir -p "${1%/*}"; x_ cp "$tmprom" "$1"
 }