libpayload: Make Kconfig bools use IS_ENABLED()

This will make the code work with the different styles
of Kconfig (emit unset bools vs don't emit unset bools)

Roughly, the patch does this, and a little bit of fixing up:

perl -pi -e 's,ifdef (CONFIG_LP_.+?)\b,if IS_ENABLED\($1\),g' `find . -name *.[ch]`
perl -pi -e 's,ifndef (CONFIG_LP_.+?)\b,if !IS_ENABLED\($1\),g' `find . -name *.[ch]`

Change-Id: Ib8a839b056a1f806a8597052e1b571ea3d18a79f
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10711
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/payloads/libpayload/drivers/usb/usb.c b/payloads/libpayload/drivers/usb/usb.c
index b97ba6f..6174d63 100644
--- a/payloads/libpayload/drivers/usb/usb.c
+++ b/payloads/libpayload/drivers/usb/usb.c
@@ -530,7 +530,7 @@
 		break;
 	case hid_device:
 		usb_debug ("HID\n");
-#ifdef CONFIG_LP_USB_HID
+#if IS_ENABLED(CONFIG_LP_USB_HID)
 		dev->init = usb_hid_init;
 		return dev->address;
 #else
@@ -548,7 +548,7 @@
 		break;
 	case msc_device:
 		usb_debug ("MSC\n");
-#ifdef CONFIG_LP_USB_MSC
+#if IS_ENABLED(CONFIG_LP_USB_MSC)
 		dev->init = usb_msc_init;
 		return dev->address;
 #else
@@ -558,7 +558,7 @@
 	case hub_device:
 		if (speed < SUPER_SPEED) {
 			usb_debug ("hub (2.0)\n");
-#ifdef CONFIG_LP_USB_HUB
+#if IS_ENABLED(CONFIG_LP_USB_HUB)
 			dev->init = usb_hub_init;
 			return dev->address;
 #else