Revert "ANDROID: sched: Add vendor hooks for override sugov behavior"

This reverts half of commit 1a7550f7.

The hook android_vh_set_sugov_sched_attr 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: 344826816
Bug: 297343949
Cc: Wei Wang <wvw@google.com>
Cc: Qais Yousef <qyousef@google.com>
Change-Id: I5281e0bd2c8187bd7083147b3986a170bcd1077a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>