msm: ipa3: fix debugfs creation order

IPA unit-test module is initialized by IPA ready callback.
The ready callback is called before creating IPA debugfs root
folder in which IPA unit-test module depends on.

Change-Id: Id3e867cd074730a3006e124d1074bedef081920a
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>