The larb-id may be remapped in the smi-common, this means the
larb-id reported in the mtk_iommu_isr isn't the real larb-id,

Take mt8183 as a example:
                       M4U
                        |
---------------------------------------------
|               SMI common                  |
-0-----7-----5-----6-----1-----2------3-----4- <- Id remapped
 |     |     |     |     |     |      |     |
larb0 larb1 IPU0  IPU1 larb4 larb5  larb6  CCU
disp  vdec  img   cam   venc  img    cam
As above, larb0 connects with the id 0 in smi-common.
          larb1 connects with the id 7 in smi-common.
          ...
If the larb-id reported in the isr is 7, actually it's larb1(vdec).
In order to output the right larb-id in the isr, we add a larb-id
remapping relationship in this patch.

If there is no this larb-id remapping in some SoCs, use the linear
mapping array instead.

This also is a preparing patch for mt8183.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 4 ++++
 drivers/iommu/mtk_iommu.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 847082c..eca1536 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c

@@ -220,6 +220,8 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
        fault_larb = F_MMU0_INT_ID_LARB_ID(regval);
        fault_port = F_MMU0_INT_ID_PORT_ID(regval);

+       fault_larb = data->plat_data->larbid_remap[fault_larb];
+
        if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
                               write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) {
                dev_err_ratelimited(

@@ -742,12 +744,14 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
        .m4u_plat     = M4U_MT2712,
        .has_4gb_mode = true,
        .has_bclk     = true,
+       .larbid_remap = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
 };

 static const struct mtk_iommu_plat_data mt8173_data = {
        .m4u_plat     = M4U_MT8173,
        .has_4gb_mode = true,
        .has_bclk     = true,
+       .larbid_remap = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */