chromeos / broadwell / jecht: Make save_chromeos_gpios() jecht-specific

This callback was only required for a single mainboard, and it can
easily be moved to mainboard-specific code. This patch removes it from
the global namespace and isolates it to the Jecht board. (This makes
it easier to separate vboot and chromeos code in a later patch.)

Change-Id: I9cf67a75a052d1c86eda0393b6a9fbbe255fedf8
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/18981
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/vendorcode/google/chromeos/chromeos.c

@@ -23,11 +23,6 @@ int __attribute__((weak)) clear_recovery_mode_switch(void)
 	return 0;
 }
 
-void __attribute__((weak)) save_chromeos_gpios(void)
-{
-	// Can be implemented by a mainboard
-}
-
 int __attribute__((weak)) get_sw_write_protect_state(void)
 {
 	// Can be implemented by a platform / mainboard

src/vendorcode/google/chromeos/chromeos.h

@@ -24,8 +24,6 @@
 #include <vboot/misc.h>
 #include <vboot/vboot_common.h>
 
-void save_chromeos_gpios(void);
-
 #if CONFIG_CHROMEOS
 /* functions implemented in watchdog.c */
 void mark_watchdog_tombstone(void);