DynamicTablesPkg: Add DynamicTablesScmiInfoLib

The SCP holds some power information that could be advertised
through the _CPC object. The communication with the SCP is done
through SCMI protocols (c.f. ArmScmiDxe).

Use the SCMI protocols to query information and feed it to
the DynamicTablesPkg.

Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

DynamicTablesPkg/Include/Library/DynamicTablesScmiInfoLib.h

@@ -0,0 +1,33 @@
+/** @file
+  Arm SCMI Info Library.
+
+  Copyright (c) 2022 - 2023, Arm Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef ARM_SCMI_INFO_LIB_H_
+#define ARM_SCMI_INFO_LIB_H_
+
+#include <ConfigurationManagerObject.h>
+
+/** Populate a AML_CPC_INFO object based on SCMI information.
+
+  @param[in]  DomainId    Identifier for the performance domain.
+  @param[out] CpcInfo     If success, this structure was populated from
+                          information queried to the SCP.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_DEVICE_ERROR        Device error.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_TIMEOUT             Time out.
+  @retval EFI_UNSUPPORTED         Unsupported.
+**/
+EFI_STATUS
+EFIAPI
+DynamicTablesScmiInfoGetFastChannel (
+  IN  UINT32        DomainId,
+  OUT AML_CPC_INFO  *CpcInfo
+  );
+
+#endif // ARM_SCMI_INFO_LIB_H_