dm: build vRTCT of Software SRAM for Post-launch RTVM

This patch prepares vRTCT for post-RTVM instead of
  pass-thru native RTCT:
   - Configurations are based on Service VM native RTCT.
   - Remap vLAPIC IDs in vRTCT.
   - Remap base address of SW SRAM memory regions
     from HPA to GPA.
   - HPA base of Software SRAM shall be parsed from PTCT
     instead of hardcoding.

Tracked-On: #5649
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
Reviewed-by: Fei Li <fei1.li@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>

devicemodel/include/acpi.h

@@ -39,6 +39,27 @@
 
 #define	IO_PMTMR		0x0	/* PM Timer is disabled in ACPI */
 
+struct acpi_table_hdr {
+	/* ASCII table signature */
+	char                    signature[4];
+	/* Length of table in bytes, including this header */
+	uint32_t                length;
+	/* ACPI Specification minor version number */
+	uint8_t                 revision;
+	/* To make sum of entire table == 0 */
+	uint8_t                 checksum;
+	/* ASCII OEM identification */
+	char                    oem_id[6];
+	/* ASCII OEM table identification */
+	char                    oem_table_id[8];
+	/* OEM revision number */
+	uint32_t                oem_revision;
+	/* ASCII ASL compiler vendor ID */
+	char                    asl_compiler_id[4];
+	/* ASL compiler version */
+	uint32_t                asl_compiler_revision;
+} __packed;
+
 /* All dynamic table entry no. */
 #define NHLT_ENTRY_NO		8