ANDROID: DEBUG: Temporarily disable lockdep asserting on update_task_ravg

It looks like the scheduler does not expect to hold the dest_rq lock when
changing task_cpu. While we figure out the correct fix, temporarily
disable the assertions.

Change-Id: I9fae95e55387b5a9e5a66ba71b375afac1ec7922
Signed-off-by: Chris Redpath <chris.redpath@arm.com>