python3-misc: add python3-audio to RDEPENDS

Import issues are encountered for the python3 aifc module,
on images with python3-misc installed:

|>>> import aifc
|Traceback (most recent call last):
|File "<stdin>", line 1, in <module>
|File "/usr/lib64/python3.7/aifc.py", line 254, in <module>
|from chunk import Chunk
|ModuleNotFoundError: No module named 'chunk'
|>>>

The chunk module is part of python3-audio. Add python3-audio
to RDEPENDS for python3-misc to fix the error.

Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>