msm: kgsl: Submit a set of critical packets right after ME init

During the initialization sequence, submit a set of important
packets to the GPU in order to pre-load the I-cache with the
critical ucode instructions.

CRs-Fixed: 978777
Change-Id: Ic6a17b24d8c3aa383af8e25cf9ef771459d65796
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>