ACPICA: SPCR: Update the SPCR table to version 4

ACPICA commit 1eeff52124a45d5cd887ba5687bbad0116e4d211

The Microsoft Serial Port Console Redirection (SPCR) specification
revision 1.09 comprises additional fields [1]. The newly added fields
are:
- RISC-V SBI
- Precise Baud Rate
- namespace_string_length
- namespace_string_offset
- namespace_string

Additionaly, this code will support up to SPCR revision 1.10, as it
includes only minor wording changes.

Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table # [1]
Link: acpica/acpica@1eeff521
Signed-off-by: Sia Jee Heng <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: Sia Jee Heng

include/acpi/actbl3.h

@@ -92,10 +92,10 @@ struct acpi_table_slit {
 /*******************************************************************************
  *
  * SPCR - Serial Port Console Redirection table
- *        Version 2
+ *        Version 4
  *
  * Conforms to "Serial Port Console Redirection Table",
- * Version 1.03, August 10, 2015
+ * Version 1.10, Jan 5, 2023
  *
  ******************************************************************************/
 
@@ -112,15 +112,19 @@ struct acpi_table_spcr {
 	u8 stop_bits;
 	u8 flow_control;
 	u8 terminal_type;
-	u8 reserved1;
+	u8 language;
 	u16 pci_device_id;
 	u16 pci_vendor_id;
 	u8 pci_bus;
 	u8 pci_device;
 	u8 pci_function;
 	u32 pci_flags;
 	u8 pci_segment;
-	u32 reserved2;
+	u32 uart_clk_freq;
+	u32 precise_baudrate;
+	u16 name_space_string_length;
+	u16 name_space_string_offset;
+	char name_space_string[];
 };
 
 /* Masks for pci_flags field above */