ACPICA: WSMT: Fix typo, no functional change

ACPICA commit 764d18c5a83949ff3b0dbda6055cee1929b9caa2

The table signature WSMT stands for "Windows SMM Mitigations Table".
It is not "Windows SMM Migrations Table".

Link: https://github.com/acpica/acpica/commit/764d18c5Reported-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/acpi/actbl3.h

@@ -39,7 +39,7 @@
 #define ACPI_SIG_WDDT           "WDDT"	/* Watchdog Timer Description Table */
 #define ACPI_SIG_WDRT           "WDRT"	/* Watchdog Resource Table */
 #define ACPI_SIG_WPBT           "WPBT"	/* Windows Platform Binary Table */
-#define ACPI_SIG_WSMT           "WSMT"	/* Windows SMM Security Migrations Table */
+#define ACPI_SIG_WSMT           "WSMT"	/* Windows SMM Security Mitigations Table */
 #define ACPI_SIG_XENV           "XENV"	/* Xen Environment table */
 #define ACPI_SIG_XXXX           "XXXX"	/* Intermediate AML header for ASL/ASL+ converter */
 
@@ -673,10 +673,10 @@ struct acpi_table_wpbt {
 
 /*******************************************************************************
  *
- * WSMT - Windows SMM Security Migrations Table
+ * WSMT - Windows SMM Security Mitigations Table
  *        Version 1
  *
- * Conforms to "Windows SMM Security Migrations Table",
+ * Conforms to "Windows SMM Security Mitigations Table",
  * Version 1.0, April 18, 2016
  *
  ******************************************************************************/