backtrace: Print backtrace in assert() and panic()

When any of these functions is called the backtrace will be printed to
the console.

Change-Id: Id60842df824b320c485a9323ed6b80600f4ebe35
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/lib/libc/assert.c b/lib/libc/assert.c
index fa12cb6..8fa8f72 100644
--- a/lib/libc/assert.c
+++ b/lib/libc/assert.c
@@ -20,19 +20,23 @@
 void __assert(const char *file, unsigned int line, const char *assertion)
 {
 	printf("ASSERT: %s:%d:%s\n", file, line, assertion);
-	console_flush();
+	backtrace("assert");
+	(void)console_flush();
 	plat_panic_handler();
 }
 #elif PLAT_LOG_LEVEL_ASSERT >= LOG_LEVEL_INFO
 void __assert(const char *file, unsigned int line)
 {
 	printf("ASSERT: %s:%d\n", file, line);
-	console_flush();
+	backtrace("assert");
+	(void)console_flush();
 	plat_panic_handler();
 }
 #else
 void __assert(void)
 {
+	backtrace("assert");
+	(void)console_flush();
 	plat_panic_handler();
 }
 #endif