Revert "workqueue: Fix hung time report of worker pools"

This reverts commit 64778134 which is
commit 335a42eb upstream.

It breaks the Android kernel abi, so revert it.  If it needs to come
back later, it can do so in an abi-safe way.

Bug: 161946584
Change-Id: I702fcb45a1147789f1ff78ed07500162e8632d5f
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>