[RAMEN9610-12270] g2d: add missing IOMMU_CACHE to iommu mapping

[RAMEN9610-12270] g2d: add missing IOMMU_CACHE to iommu mapping

IOMMU_CACHE should be specified to iovmm_map() if G2D supports IO Cache
Coherency but it was missing because ION and IOMMU drivers adds
IOMMU_CACHE if their clients has DMA attributes of IO cache coherency.
But it is not correct to delegate configuration to IOMMU_CACHE to ION
and IOMMU drivers because G2D driver does not have any room to change
such configurations.

Change-Id: I6c20727c913af52781230669621bf8cf12faafdc
Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>