Update IORT SMMUv3 IORT node flags for HTTU to include dirty state su…

…pport (#500)

# Preface

Please ensure you have read the [contribution
docs](https://github.com/microsoft/mu/blob/master/CONTRIBUTING.md) prior
to submitting the pull request. In particular,
[pull request
guidelines](https://github.com/microsoft/mu/blob/master/CONTRIBUTING.md#pull-request-best-practices).

## Description
Fixes #498

The flag for HTTU override in an SMMUv3 node in the IORT table is
currently define in
MU_BASECORE/MdePkg/Include/IndustryStandard/IoRemappingTable.h:63 as:
```
#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE     BIT1
```

The length of this field is actually 2 bits. Possible values are:

0b0000: Hardware update of the Access flag and dirty state are not
supported.
0b0001: Support for hardware update of the Access flag for Block and
Page descriptors.
0b0010: As 0b0001, and adds support for hardware update of the Access
flag for Block and Page descriptors. Hardware update of dirty state is
supported.

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- [ ] Impacts functionality?
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## How This Was Tested

Tested on Arm64 platform

## Integration Instructions

update flags in IORT table if consuming this flag definition

---------

Co-authored-by: joelopez <[email protected]>

MdePkg/Include/IndustryStandard/IoRemappingTable.h

@@ -59,8 +59,11 @@
 #define EFI_ACPI_IORT_SMMUv1v2_INT_FLAG_LEVEL  0x0
 #define EFI_ACPI_IORT_SMMUv1v2_INT_FLAG_EDGE   0x1
 
-#define EFI_ACPI_IORT_SMMUv3_FLAG_COHAC_OVERRIDE    BIT0
-#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE     BIT1
+#define EFI_ACPI_IORT_SMMUv3_FLAG_COHAC_OVERRIDE  BIT0
+// MU_CHANGE Start
+#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE     BIT1  // HW update of Access Flag supported
+#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE_DS  BIT2  // HW update of Access Flag + Dirty Flag supported
+// MU_CHANGE End
 #define EFI_ACPI_IORT_SMMUv3_FLAG_PROXIMITY_DOMAIN  BIT3
 #define EFI_ACPI_IORT_SMMUv3_FLAG_DEVICEID_VALID    BIT4