msm: kgsl: Set iommu upstream hint flag only if LLCC is enabled

Currently, driver is setting IOMMU_USE_UPSTREAM_HINT flag based on
whether DOMAIN_ATTR_USE_LLC_NWA is set or not, which is incorrect
as this should be set only if corresponding iommu domain attribtute
DOMAIN_ATTR_USE_UPSTREAM_HINT is set. This is needed to make sure
we don't set IOMMU_USE_UPSTREAM_HINT if CONFIG_QCOM_LLCC is not
enabled as DOMAIN_ATTR_USE_UPSTREAM_HINT will only be set if LLCC
is enabled.

Change-Id: Ic33edcf2976dcd2c0a04aef567269f666223ec45
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>