msm: kgsl: Don't set up the secure page table

The secure page table is not currently supported.
Skip setting it up to prevent instability.

Change-Id: I42c889ac24fa66713291738a1744828c47562362
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
Signed-off-by: Oleg Perelet <operelet@codeaurora.org>