mali_kbase: platform: Use kernel tracepoint for util

The current mechanism we use to report GPU utilization
emulates usermode trace points which has some downsides.
This change hijacks the clock_set_rate tracepoint to
report utilization data as a temporary fix for these
downsides. See linked bugs for more info.

Bug: 184175367
Bug: 187175695
Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: I071af22c7f39676418629ed8a84408f9864f97f0