Remove dead loops in assert() in C and ASM

The desired behaviour is to call `plat_panic_handler()`, and to use
`no_ret` to do so from ASM.

Change-Id: I88b2feefa6e6c8f9bf057fd51ee0d2e9fb551e4f
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/lib/stdlib/assert.c b/lib/stdlib/assert.c
index cb3f355..3486e50 100644
--- a/lib/stdlib/assert.c
+++ b/lib/stdlib/assert.c
@@ -42,5 +42,5 @@
 
 	console_flush();
 
-	while(1);
+	plat_panic_handler();
 }