sched: walt: Remove CFS_BANDWIDTH support in WALT

WALT load tracking supports CFS_BANDWIDTH, which is not enabled for
Android and no users available for it. Remove it.

Change-Id: I4f3c66a1b567976aadb4a4f91a3dd66230386981
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>