elog: Add event type for CPU thermal trip

There is a status bit for this event in most intel chipsets that
we can read and report.  Start by adding the new event type.

Change-Id: Ib06411e3b87a1d069fb469943dd445bee6c1291f
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/199370
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
(cherry picked from commit 386a06170ec5afb31d0fe93ace3afbaab897a598)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/7004
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/include/elog.h

@@ -145,6 +145,9 @@ struct elog_event_data_me_extended {
 /* EC Shutdown Reason */
 #define ELOG_TYPE_EC_SHUTDOWN             0xa5
 
+/* CPU Thermal Trip */
+#define ELOG_TYPE_THERM_TRIP              0xa7
+
 extern int elog_init(void);
 extern int elog_clear(void);
 extern void elog_add_event_raw(u8 event_type, void *data, u8 data_size);