icu: fix make_icudata dependencies

The make_icudata task is set before the configure task then the
dependencies for this task are not populate yet.

Fixed it by adding do_prepare_recipe_sysroot task dependency to the
make_icudata task.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>