mali_kbase: Allow APC support for CSF

The struct definition for Asynchronous Power Control was
erroneously placed within a non-CSF block which breaks CSF
builds. Since this functionality is independent of the
front-end type, it has been moved into a section that
applies to both CSF and JM builds.

Bug: 170337464
Bug: 183242629
Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: Idb265c152ca56afe03122c727165d29009e295ff