tests: Add UDF hdd image with emoji label created by mkudffs 2.2

tests: Add UDF hdd image with emoji label created by mkudffs 2.2

mkudffs 2.2 can create UDF filesystem which label contains Unicode code
points above U+FFFF which cannot be represented by UCS-2 encoding and
therefore UTF-16 needs to be used (via surrogate pairs). Unicode code
points above U+FFFF are encoded in UTF-8 by four bytes and some example is
emoji "😀".

This is test case to check that libblkid correctly supports UTF-16
decoding. It was created by mkudffs 2.2:

$ dd if=/dev/zero of=udf-hdd-mkudffs-2.2.img bs=1M count=10
$ mkudffs -l 😀 udf-hdd-mkudffs-2.2.img