Revert "ALSA: jack: Access input_dev under mutex"

This reverts commit c093b62c which is
commit 1b6a6fc5280e97559287b61eade2d4b363e836f2 upstream.  It breaks the
kernel abi and is not relevant for Android systems.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I18399bc9d5e48a84f513302e2eabff255e9a931a