include/ich_descriptors.h: Add missing include

Avoid transitively including the bool type for the ich_descriptor
functionality.

Change-Id: I2d9eb833ca9198c0586543d3f0074893aac5c6fb
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/66348
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matei Dibu <matdibu@protonmail.com>
Reviewed-by: Thomas Heijligen <src@posteo.de>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

include/ich_descriptors.h

@@ -20,6 +20,7 @@
 
 #include <sys/types.h>
 #include <stdint.h>
+#include <stdbool.h>
 #include "programmer.h" /* for enum ich_chipset */
 
 /* FIXME: Replace with generic return codes */