tree: Make internal functions static

None of these functions are used outside of the files they are defined
in, so make them all static.

Change-Id: Ie9cbe12d289bcedacf2f1bf483ae64ef8039ccc1
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/33667
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/it85spi.c b/it85spi.c
index e47cabb..1d1ecad 100644
--- a/it85spi.c
+++ b/it85spi.c
@@ -106,7 +106,7 @@
 
 /* IT8502 employs a scratch RAM when flash is being updated. Call the following
  * two functions before/after flash erase/program. */
-void it85xx_enter_scratch_rom(void)
+static void it85xx_enter_scratch_rom(void)
 {
 	int ret, tries;
 
@@ -163,7 +163,7 @@
 	}
 }
 
-void it85xx_exit_scratch_rom(void)
+static void it85xx_exit_scratch_rom(void)
 {
 #if 0
 	int ret;