Move keepalive constants to their right place

The constants CMD_{ADD,REMOVE}_KEEPALIVE_PACKET_FILTER are too
high in the file and not in order. These constants should be
moved back to their rightful place.

Bug: 123987395
Test: 1. m -j 2. m -j doc-comment-check-docs
Change-Id: I44c827d3a2011cf7c66c0444566e14192fec1b1b
1 file changed
tree: c7bfdeb15e5952f5c7fccef04e95c73f4350169a
  1. core/
  2. services/
  3. tests/