Revert "net: Fix unwanted sign extension in netdev_stats_to_stats64()"

This reverts commit b17d81b9 which is
commit 9b55d3f0a69af649c62cbc2633e6d695bb3cc583 upstream.

It is needed to be reverted as it relies on an abi-breaking change that
also must be reverted.  It's not really needed for Android systems, but
if it is needed to come back, it can be reworked to be a CRC-abi neutral
change if so desired.

Bug: 161946584
Change-Id: I375a29e01f3758f89f74bea69183e3990e01043c
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>