ELOG: Introduce elog_gsmi variants

This avoids a lot of if (CONFIG(ELOG_GSMI)) boilerplate.

Change-Id: I87d25c820daedeb33b3b474a6632a89ea80b0867
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36647
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/strago/smihandler.c

@@ -61,11 +61,9 @@ static uint8_t mainboard_smi_ec(void)
 	uint16_t pmbase = get_pmbase();
 	uint32_t pm1_cnt;
 
-#if CONFIG(ELOG_GSMI)
 	/* Log this event */
 	if (cmd)
-		elog_add_event_byte(ELOG_TYPE_EC_EVENT, cmd);
-#endif
+		elog_gsmi_add_event_byte(ELOG_TYPE_EC_EVENT, cmd);
 
 	switch (cmd) {
 	case EC_HOST_EVENT_LID_CLOSED: