mali_kbase: platform: Add custom logging function interface

Pass all Pixel integration logging through a macro that allows
for configuring logging verbosity to be set for the Pixel
integration in seclusion.

Bug: 156057140
Bug: 158091247
Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: Ib70783676dd3c3b62c5f455f6baebe4d77821298