lib/spd_bin.c: Drop CAR_GLOBAL_MIGRATION support

Change-Id: I1c307e1d5532929de6d876ce9215515ab1cf4652
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37031
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/spd_bin.h

@@ -16,7 +16,6 @@
 #ifndef SPD_BIN_H
 #define SPD_BIN_H
 
-#include <arch/early_variables.h>
 #include <stdint.h>
 #include <commonlib/region.h>