kill CAR_GLOBAL_MIGRATION leftovers

Change-Id: Ia3b2c10af63cd0cab42dc39f479cb69bc4df9124
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37055
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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/arch/x86/Kconfig

@@ -219,7 +219,6 @@ config VERSTAGE_ADDR
 config POSTCAR_STAGE
 	def_bool y
 	depends on ARCH_X86
-	depends on !CAR_GLOBAL_MIGRATION
 
 config VERSTAGE_DEBUG_SPINLOOP
 	bool