Revert "usb: musb: omap2430: fix device leak at unbind"

This reverts commit 90a53102 which is
commit 1473e9e7 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ic1868537b939bc6c787e3b5b7f8744060e720ea3
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>