ubi-utils: fix wrong PKG_NAME, bump copyright, add build dependency on zlib

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41192 3c298f89-4303-0410-b956-a3cf2f4a3e73