intel/truxton: Add dummy cache-as-ram region

Board has no chance of working without a cache_as_ram.inc, but without
a specified CAR region we also break builds.

Change-Id: I98e9db38c5e0a7bf4a1b8d2f8a693cc8d0c773b9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7863
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/cpu/intel/ep80579/Kconfig

@@ -5,3 +5,19 @@ 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
+
+# These are just dummy values to keep build happy.
+# This CPU does not have tested cache_as_ram.inc.
+
+config DCACHE_RAM_BASE
+	hex
+	default 0xffaf8000
+
+config DCACHE_RAM_SIZE
+	hex
+	default 0x8000
+
+endif