msm: kgsl: Use DOMAIN_ATTR_USE_LLC_NWA attribute

on A640, setting the memory attributes for system cache
allocation has changed with the new MMU integration.
Now we need to specify this attribute for a domain, in
order to set the memory attributes for page table walk
to be read-allocate, write-no-allocate.
Also, use the new IOMMU_USE_LLC_NWA flag to specify the
same attributes for the rest of the GPU traffic.

Change-Id: I38029a77a3470ef5305a4cdcdfd40f5bdc69cfcf
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>