arch/x86: Flip option NO_CAR_GLOBAL_MIGRATION

It is easier to track CAR_GLOBAL_MIGRATION which is
the approach to be deprecated with the next release.

This change enforces new policy; POSTCAR_STAGE=y is
not allowed together with CAR_GLOBAL_MIGRATION=y.

Change-Id: I0dbad6a14e68bf566ac0f151dc8ea259e5ae2250
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34804
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/Kconfig

@@ -57,7 +57,6 @@ config CPU_SPECIFIC_OPTIONS
 	select PCIEXP_CLK_PM
 	select PCIEXP_L1_SUB_STATE
 	select PCIEX_LENGTH_256MB
-	select POSTCAR_STAGE
 	select PMC_INVALID_READ_AFTER_WRITE
 	select PMC_GLOBAL_RESET_ENABLE_LOCK
 	select REG_SCRIPT