Revert "msm: kgsl: Do not set up the zap shader"

Zap shader needs to be enabled to bring GPU out of secured mode
when access-control is enabled in TZ.
This reverts commit 73acf0b6.

Change-Id: I0f3f7ec6b0541aeeead4f08ab83716c193bcfbf1
Signed-off-by: Lokesh Batra <lbatra@codeaurora.org>