mali_kbase: platform: dvfs: Support mali_kbase_clk_rate_trace_mgr

Adds support for the Clock Rate Trace interface which allows a
platform integration to communicate GPU frequency with the
core Mali driver.

Bug: 186691999
Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: I9842faa38f0f97828404351111d8455e5f81a787