msm: kgsl: Remove unneeded static inline functions

Over the years we have really abused inline functions in the driver code.
Remove a chunk of the "functions" that are single use or otherwise
just not worth it.

As a bonus, moving the functions around exposed a single use of some
adreno_reg registers in a3xx that we could get rid of that while we
are mucking about.

Change-Id: Ic0dedbad85df436cbd7e5746964200ee9f87e1a4
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>