[packages] change ownership of the audiodevices to the pulse group to make it useable 
by pulseaudio

Fixes #14175

Signed-off-by: Peter Wagner <tripolar@gmx.at>


git-svn-id: svn://svn.openwrt.org/openwrt/packages@38045 3c298f89-4303-0410-b956-a3cf2f4a3e73