drivers/elog: remove unnecessary global state

There were 3 variables indicating the state of the event log
region. However, there's no need to keep track of those
individually. The only thing required is to know is if
elog_scan_flash() failed. There's no other tracking required
beyond that.

BUG=chrome-os-partner:55932

Change-Id: I88ad32091d3c37966a2ac6272f8ad95bcc8c4270
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/16100
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/drivers/elog/elog_internal.h

@@ -45,20 +45,4 @@ struct event_header {
 /* SMBIOS Type 15 related constants */
 #define ELOG_HEADER_TYPE_OEM		0x88
 
-typedef enum elog_area_state {
-	ELOG_AREA_UNDEFINED,		/* Initial boot strap state */
-	ELOG_AREA_EMPTY,		/* Entire area is empty */
-	ELOG_AREA_HAS_CONTENT,		/* Area has some content */
-} elog_area_state;
-
-typedef enum elog_header_state {
-	ELOG_HEADER_INVALID,
-	ELOG_HEADER_VALID,
-} elog_header_state;
-
-typedef enum elog_event_buffer_state {
-	ELOG_EVENT_BUFFER_OK,
-	ELOG_EVENT_BUFFER_CORRUPTED,
-} elog_event_buffer_state;
-
 #endif /* ELOG_INTERNAL_H_ */