Revert "modules: inherit TAINT_PROPRIETARY_MODULE"

This reverts commit 2ab98abf which is
commit 262e6ae7081df304fc625cf368d5c2cbba2bb991 upstream.

It breaks the ABI here, and it's not something needed in this old kernel
that is not getting new devices added for it.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I5058656c9ab1988b669b90ab90a07ad77cd8eb6b