Revert "ANDROID: Sched: Add vendor hooks in scheduler"

This reverts commit 70722058.

The hook android_rvh_schedule_bug is not used by any vendor, so remove
it to help with merge issues with future LTS releases.

If this is needed by any real user, it can easily be reverted to add it
back and then the symbol should be added to the abi list at the same
time to prevent it from being removed again later.

Bug: 203756332
Bug: 200103201
Bug: 234483895
Cc: Sai Harshini Nimmala <quic_snimmala@quicinc.com>
Change-Id: I7c150262515e8205c7beddd4d2b358597c98478a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>