msm: kgsl: Get rid of clk-map

clk-map is another one of those historical oddities that we've had
forever. Luckily we have made the transition to clock-names for other
reasons so we already have all the information we need. Get rid of
clk-map and the associated infrastructure.

Change-Id: Ic0dedbad82c0a87ce98b37f9e66788fc16407ae6
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>