Revert "usb: musb: omap2430: Convert to platform remove callback returning void"

This reverts commit 1be6c638 which is
commit cb020bf5 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: I865c45ee004a259904f96475160b67080639d355
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>