ANDROID: sched: cpufreq_schedutil: move sugov traces to sched

Since the sugov traces were added in kernel/sched/cpufreq_schedutil.c,
move it from power.h to sched.h.
And move the tracepoint to where the change happens.

Bug: 174488007
Test: build pass and boot to home
Signed-off-by: Jimmy Shiu <jimmyshiu@google.com>
Change-Id: Ibe18f04773c28be84db3619b1a4253bf08f0e289
Signed-off-by: Will McVicker <willmcvicker@google.com>