ArmPkg/SmmuDxe: Add per-streamId isolation for each DMA capable device

Replaces the previous shared-root model with on-demand per-StreamID
stage-2 isolation:

  * Each StreamID gets its own stage-2 page-table root and VMID,
    allocated lazily on the first IoMmuSetAttribute call and promoted
    via break-before-make.
  * Aliases (multiple StreamIDs for one logical device) share the
    primary's root + VMID, so a single page-table update covers all
    of them and TLB invalidation by (VMID, IPA) is alias-safe.
  * DeviceHandleToStreamId resolves an EFI_HANDLE to its StreamID(s)
    and owning SMMU base via PciIo->GetLocation: real PCIe goes
    through the IORT Root Complex node; non-discoverable devices are
    detected when GetLocation() returns Segment 0xFF, from which the
    UniqueId is extracted and looked up in the NC HOB table to find
    the matching IORT Named Component node.
  * IoMmuSetAttributeById provides the same isolation for handle-less
    DMA agents using (IommuBase, StreamId) directly.
  * GIC EVTQ/GERR IRQs are registered per SMMU so faults surface
    immediately via SmmuV3LogErrors.
  * ExitBootServices is per-SMMU: RMR-bearing SMMUs go to bypass,
    others go to global-abort.

Platform interface additions:
  * SMMU_CONFIG gains NcDeviceListSize / NcDeviceListOffset.
  * SMMU_NC_DEVICE_ENTRY {UniqueId, ObjName[32]} maps each platform
    UniqueId to an IORT Named Component name.

See ArmPkg/Drivers/SmmuDxe/README.md for flow diagrams, HOB layout,
and platform integration steps.

Author: eeshanl

ArmPkg/Drivers/SmmuDxe/IoMmu.c

@@ -23,6 +23,9 @@
 #define PAGE_TABLE_DESCRIPTOR       (0x1 << 1)
 #define PAGE_TABLE_READ_WRITE_FROM_IOMMU_ACCESS(IoMmuAccess)  (IoMmuAccess << 6)
 
+// Forward declaration; full definition lives in SmmuV3.h.
+typedef struct _SMMU_INFO SMMU_INFO;
+
 typedef UINT64 PAGE_TABLE_ENTRY;
 
 #define PAGE_TABLE_SIZE  (EFI_PAGE_SIZE / sizeof(PAGE_TABLE_ENTRY))  // Number of entries in a page table
@@ -35,7 +38,9 @@ typedef struct _PAGE_TABLE {
 /**
   Update the page table mapping with the given physical address and flags.
 
+  @param [in]  SmmuInfo                   SMMU instance.
   @param [in]  Root                       Pointer to the root page table.
+  @param [in]  Vmid                       VMID for associated page table root.
   @param [in]  PhysicalAddress            Physical address to map.
   @param [in]  Bytes                      Number of bytes to map.
   @param [in]  Flags                      Flags to set for the mapping. 12 bits or less.
@@ -47,7 +52,9 @@ typedef struct _PAGE_TABLE {
 **/
 EFI_STATUS
 UpdatePageTable (
+  IN SMMU_INFO   *SmmuInfo,
   IN PAGE_TABLE  *Root,
+  IN UINT16      Vmid,
   IN UINT64      PhysicalAddress,
   IN UINT64      Bytes,
   IN UINT16      Flags,