Revert "net: activity_stats: Add statistics for network transmission activity"

This reverts commit afedd7be.

Change-Id: Ibc9160b445254b0212c23664a94fd27b7788aa76
CRs-Fixed: 1035969
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Git-commit: 42d9422a
Git-repo: https://android.googlesource.com/kernel/common/


[bflowers@codeaurora.org: Fix-up internal configs]
Signed-off-by: Bryse Flowers <bflowers@codeaurora.org>