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>
diff --git a/sst_fwhub.c b/sst_fwhub.c
index 398b01b..c712303 100644
--- a/sst_fwhub.c
+++ b/sst_fwhub.c
@@ -19,6 +19,7 @@
 /* Adapted from the Intel FW hub stuff for 82802ax parts. */
 
 #include "flash.h"
+#include "chipdrivers.h"
 
 static int check_sst_fwhub_block_lock(struct flashctx *flash, int offset)
 {