ANDROID: sched: Add vendor hooks for find_energy_efficient_cpu

Add hooks for vendor specific find_energy_efficient_cpu logic.

Bug: 170507310
Bug: 265387484
Bug: 329341111
Bug: 377187885

Signed-off-by: Rick Yiu <rickyiu@google.com>
Change-Id: I064b501017e32d4f22f8128bed8bf3a1508ab15b
(cherry picked from commit 2f108e2e)
Signed-off-by: Will McVicker <willmcvicker@google.com>
(cherry picked from commit 147a9b3d)
Signed-off-by: Han Lin <han.lin@mediatek.com>
(cherry picked from commit cbcd3a64)