drivers: cpufreq: cpu-boost: Add sync limit to cpu-boost
Perform frequency synchronization only when source CPU's frequency
is less than sync_threshold, else sync to the sync_threshold.

Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>

Change-Id: I544c414568d4e015b80ce5891dd215275bac95da

Conflicts:

	kernel/sched.c