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>

common/aarch32/debug.S

@@ -75,7 +75,7 @@ func do_panic
 
 1:
 	mov	lr, r6
-	b	plat_panic_handler
+	no_ret	plat_panic_handler
 endfunc do_panic
 
 	/***********************************************************

common/aarch64/debug.S

@@ -98,7 +98,7 @@ func asm_assert
 	asm_print_line_dec
 	bl	plat_crash_console_flush
 _assert_loop:
-	b	_assert_loop
+	no_ret	plat_panic_handler
 endfunc asm_assert
 #endif
 

lib/stdlib/assert.c

@@ -42,5 +42,5 @@ void __assert (const char *function, const char *file, unsigned int line,
 
 	console_flush();
 
-	while(1);
+	plat_panic_handler();
 }