southbridge/intel/lynxpoint: Fix undefined behavior

Fix reports found by undefined behavior sanitizer. Left shifting an int
where the right operand is >= the width of the type is undefined. Add
UL suffix since it's safe for unsigned types.

Change-Id: I755b3c80a8d1b6cb6b6e5f411c6691e5dd17c266
Signed-off-by: Ryan Salsamendi <rsalsamendi@hotmail.com>
Reviewed-on: https://review.coreboot.org/20443
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/southbridge/intel/lynxpoint/pmutil.c

@@ -45,7 +45,7 @@ static void print_status_bits(u32 status, const char *bit_names[])
 		return;
 
 	for (i=31; i>=0; i--) {
-		if (status & (1 << i)) {
+		if (status & (1UL << i)) {
 			if (bit_names[i])
 				printk(BIOS_DEBUG, "%s ", bit_names[i]);
 			else