sched: sched-boost: Add support for multi cluster systems

This change adds support for multi cluster systems by skipping
min capacity CPUs when boost is set.

Change-Id: I46da657a41b4d854cbbe37c2ab262cd2dca0da33
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>