kgsl: Gen7: Enable access protection for LPAC pipeline

Enable access protection for LPAC pipeline so that command
processor will restrict access to a block of registers from
within the command stream. Any attempt to access protected
register space will result in fault.

Change-Id: Ia8d391f7b9ad1b5d38e7d4d8ac727d2d3f54f53a
Signed-off-by: Hareesh Gundu <quic_hareeshg@quicinc.com>
(cherry picked from commit 28e9ef97)