msm: kgsl: Do not mark microcode buffers as NOEXEC

Microcode buffers should not be marked as NOEXEC
as they contain executable instruction. All other
buffers should be marked NOEXEC for security reasons.

Change-Id: I11aa5fa416e753ef48115aa983f21f2d01e40254
Signed-off-by: Sushmita Susheelendra <ssusheel@codeaurora.org>
Signed-off-by: Oleg Perelet <operelet@codeaurora.org>
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>