arch/x86/smbios: Update SMBIOS type 0 ec version

Update embedded controller firmware version for SMBIOS type 0.

TEST=Execute "dmidecode -t 0" to check if the ec version is correct

Signed-off-by: Tim Chu <Tim.Chu@quantatw.com>
Change-Id: Ibd5ee27a1b8fa4e5bc66e359d3b62e052e19e8a2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45138
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/include/smbios.h

@@ -54,6 +54,8 @@ const char *smbios_chassis_version(void);
 const char *smbios_chassis_serial_number(void);
 const char *smbios_processor_serial_number(void);
 
+void smbios_ec_revision(uint8_t *ec_major_revision, uint8_t *ec_minor_revision);
+
 unsigned int smbios_processor_external_clock(void);
 unsigned int smbios_processor_characteristics(void);
 struct cpuid_result;