Revert "can: dev: Move device back to init netns on owning netns delete"

This reverts commit 00e17e57 which is
commit 3a5ca857 upstream.

It breaks the networking api and we do not care about CAN devices in
Android systems at this point in time.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I5d5de8fccb077249478b7d1e136f91d6be0b20cd