Revert "net: mac802154: Fix racy device stats updates by DEV_STATS_INC() and DEV_STATS_ADD()"

This reverts commit 14456372 which is
commit b8ec0dc3 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: I200be07e1dfe375005289a5b14fc8e03c28232ca
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>