DynamicTablesPkg: Add support to build _DSD

Add APIs needed to build _DSD with different UUIDs.
This is per ACPI specification 6.4 s6.2.5.

Adds support for building data packages with format
Package {"Name", Integer}

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h

@@ -1280,6 +1280,62 @@ AmlAddLpiState (
   IN  AML_OBJECT_NODE_HANDLE                  LpiNode
   );
 
+/** AML code generation for a _DSD device data object.
+
+  AmlAddDeviceDataDescriptorPackage (Uuid, DsdNode, PackageNode) is
+  equivalent of the following ASL code:
+    ToUUID(Uuid),
+    Package () {}
+
+  Cf ACPI 6.4 specification, s6.2.5 "_DSD (Device Specific Data)".
+
+  _DSD (Device Specific Data) Implementation Guide
+  https://github.com/UEFI/DSD-Guide
+  Per s3. "'Well-Known _DSD UUIDs and Data Structure Formats'"
+  If creating a Device Properties data then UUID daffd814-6eba-4d8c-8a91-bc9bbf4aa301 should be used.
+
+  @param [in]  Uuid           The Uuid of the descriptor to be created
+  @param [in]  DsdNode        Node of the DSD Package.
+  @param [out] PackageNode    If success, contains the created package node.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_OUT_OF_RESOURCES    Failed to allocate memory.
+**/
+EFI_STATUS
+EFIAPI
+AmlAddDeviceDataDescriptorPackage (
+  IN  CONST EFI_GUID                *Uuid,
+  IN        AML_OBJECT_NODE_HANDLE  DsdNode,
+  OUT       AML_OBJECT_NODE_HANDLE  *PackageNode
+  );
+
+/** AML code generation to add a package with a name and value,
+    to a parent package.
+    This is useful to build the _DSD package but can be used in other cases.
+
+  AmlAddNameIntegerPackage ("Name", Value, PackageNode) is
+  equivalent of the following ASL code:
+    Package (2) {"Name", Value}
+
+  Cf ACPI 6.4 specification, s6.2.5 "_DSD (Device Specific Data)".
+
+  @param [in]  Name           String to place in first entry of package
+  @param [in]  Value          Integer to place in second entry of package
+  @param [in]  PackageNode    Package to add new sub package to.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_OUT_OF_RESOURCES    Failed to allocate memory.
+**/
+EFI_STATUS
+EFIAPI
+AmlAddNameIntegerPackage (
+  IN CHAR8                   *Name,
+  IN UINT64                  Value,
+  IN AML_OBJECT_NODE_HANDLE  PackageNode
+  );
+
 // DEPRECATED APIS
 #ifndef DISABLE_NEW_DEPRECATED_INTERFACES