refactor(measured boot): rename a macro INVALID_ID to EVLOG_INVALID_ID

Renamed a macro 'INVALID_ID' to 'EVLOG_INVALID_ID' to avoid its clash
with other macro names and to show it is explicitly used for Event
Log driver.

Change-Id: Ie4c92b3cd1366d9a59cd6f43221e24734865f427
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/include/drivers/measured_boot/event_log/event_log.h b/include/drivers/measured_boot/event_log/event_log.h
index c6eb29c..78712af 100644
--- a/include/drivers/measured_boot/event_log/event_log.h
+++ b/include/drivers/measured_boot/event_log/event_log.h
@@ -36,9 +36,9 @@
 #endif
 
 /* Number of hashing algorithms supported */
-#define HASH_ALG_COUNT	1U
+#define HASH_ALG_COUNT		1U
 
-#define	INVALID_ID	MAX_NUMBER_IDS
+#define EVLOG_INVALID_ID	MAX_NUMBER_IDS
 
 #define MEMBER_SIZE(type, member) sizeof(((type *)0)->member)