fiptool: Remove unreferenced variable `toc_entries_len`

Change-Id: If279680a71e7fa1f801d79b8bc2cd47cd9905d33
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

tools/fiptool/tbbr_config.c

@@ -145,5 +145,3 @@ toc_entry_t toc_entries[] = {
 		.cmdline_name = NULL,
 	}
 };
-
-size_t toc_entries_len = sizeof(toc_entries) / sizeof(toc_entries[0]);

tools/fiptool/tbbr_config.h

@@ -45,6 +45,5 @@ typedef struct toc_entry {
 } toc_entry_t;
 
 extern toc_entry_t toc_entries[];
-extern size_t toc_entries_len;
 
 #endif /* __TBBR_CONFIG_H__ */