Revert "ALSA: jack: Access input_dev under mutex"

This reverts commit e2b86817 which is
commit 1b6a6fc5 upstream.

It breaks the Android kernel ABI and is not needed for Android devices,
so it is safe to revert for now.  If it is determined that it is needed
in the future, it can be brought back in an abi-preserving way.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I3b24427044ea6b385a2f686c71c6b239a3d00f18