arch/x86: Drop some __SMM__ guards

Change-Id: I64063bbae5b44f1f24566609a7f770c6d5f69fac
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36637
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/intel/baytrail/include/soc/nvs.h

@@ -104,9 +104,8 @@ typedef struct global_nvs_t {
 check_member(global_nvs_t, chromeos, GNVS_CHROMEOS_ACPI_OFFSET);
 
 void acpi_create_gnvs(global_nvs_t *gnvs);
-#ifdef __SMM__
+
 /* Used in SMM to find the ACPI GNVS address */
 global_nvs_t *smm_get_gnvs(void);
-#endif
 
 #endif /* _BAYTRAIL_NVS_H_ */