riscv and power8: Convert printk/while(1) to die

Change-Id: I277cc9ae22cd33f2cd9ded808960349d09e8670d
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/16984
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/mainboard/emulation/qemu-power8/mainboard.c b/src/mainboard/emulation/qemu-power8/mainboard.c
index 102f54c..6413f29 100644
--- a/src/mainboard/emulation/qemu-power8/mainboard.c
+++ b/src/mainboard/emulation/qemu-power8/mainboard.c
@@ -21,9 +21,7 @@
 {
 
 	if (!dev) {
-		printk(BIOS_EMERG, "No dev0; die\n");
-		while (1)
-			;
+		die("No dev0; die\n");
 	}
 
 	// Where does RAM live?