x86 cache-as-ram: Remove BROKEN_CAR_MIGRATE option

This was added to handle cases of Intel FSP platforms that had
EARLY_CBMEM_INIT but could not migrate CAR variables to CBMEM.
These boards were recently fixed.

To support combination of EARLY_CBMEM_INIT without CAR migration was
added maintenance effort with little benefits. You had no CBMEM
console for romstage and the few timestamps you could store were
circulated via PCI scratchpads or CMOS nvram.

Change-Id: I5cffb7f2b14c45b67ee70cf48be4d7a4c9e5f761
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8636
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/cpu/intel/ep80579/Kconfig

@@ -6,7 +6,6 @@ config CPU_INTEL_EP80579
 	select ARCH_RAMSTAGE_X86_32
 	select SSE
 	select SUPPORT_CPU_UCODE_IN_CBFS
-	select BROKEN_CAR_MIGRATE
 
 if CPU_INTEL_EP80579