msm: kgsl: Add additional pools of 256k and 128k

Adding additional pools for commonly used power of 2 sizes,
256k and 128k. This will allow higher order requests to be
satisfied with these pools instead of going to lower order
pools and improves the performance.

Change-Id: I448a2b169a281b3d77767ca5c5d3872fd83ac759
Signed-off-by: Neeraja P <neerp@codeaurora.org>