mb/google,samsung: Drop init_bootmode_straps()

Change-Id: Idcaf30c622bf5dc0f1295f2639c656086d01ff7e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59008
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/include/bootmode.h

@@ -6,7 +6,6 @@
 #include <stdbool.h>
 
 /* functions implemented per mainboard: */
-void init_bootmode_straps(void);
 int get_write_protect_state(void);
 int get_recovery_mode_switch(void);
 int get_recovery_mode_retrain_switch(void);