msm: kgsl: Move SOC based chip ID to the board files

Move almost all of the SOC based GPU identification code out
of the KGSL driver and into the board files.  This cleans up
the GPU side and reduces our usage of the cpu_is and machine_is
macros.

Change-Id: Ic0dedbad34eb034316b7baabf05aa7f8e8aa9ced
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>