Revert "xfrm: interface: use DEV_STATS_INC()"

This reverts commit 26a3c734 which is
commit f7c4e3e5 upstream.

It breaks the build as it relies on a commit that was earlier reverted
due to breaking the Android abi.  If this is needed in the future, it
can be brought back in an abi-safe way.

Change-Id: Icdda6ca3ef3d208043dcac2bcb0b227307d70da3
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>