ARM: dts: msm: Disable GPU memory pools for QCS605

GPU memory pools are not required on QCS605. Disable
it to release memory reserved by GPU memory pools.

Change-Id: I1a83d7afe87b75e78f01d2da16b2246b6e07bfa9
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>