abootimg: add util-linux dependency

* otherwise do_compile fails with:
  | arm-oe-linux-gnueabi-gcc  -march=armv5te -marm -mthumb-interwork --sysroot=/OE/sysroots/qemuarm -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed  abootimg.o  -lblkid -o abootimg
  | gcc/arm-oe-linux-gnueabi/4.8.2/ld: error: cannot find -lblkid
  | collect2: error: ld returned 1 exit status

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>