tree: Include missing headers for function prototypes

These files all contain functions whose prototypes are in header files,
so make sure those header files are included.

Change-Id: I0189a1550bf90d4a0b87dcef9f8a8449590cc9d7
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/33668
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

udelay.c

@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <limits.h>
 #include "flash.h"
+#include "programmer.h"
 
 static bool use_clock_gettime = false;