FSP platform microcode: Update to remove Kconfig variable

Move the Kconfig variable into a .h file - this does not need to be
in Kconfig.

Change-Id: I1db20790ddb32e0eb082503c6c60cbbefa818bb9
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: http://review.coreboot.org/7646
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
diff --git a/src/drivers/intel/fsp/cache_as_ram.inc b/src/drivers/intel/fsp/cache_as_ram.inc
index 0fc33cb..9e8b2a2 100644
--- a/src/drivers/intel/fsp/cache_as_ram.inc
+++ b/src/drivers/intel/fsp/cache_as_ram.inc
@@ -22,6 +22,7 @@
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/post_code.h>
+#include <microcode_size.h>
 #include <cbmem.h>
 
 #ifndef CONFIG_FSP_LOC
@@ -158,7 +159,7 @@
 
 CAR_init_params:
 	.long  CONFIG_CPU_MICROCODE_CBFS_LOC
-	.long  CONFIG_CPU_MICROCODE_CBFS_LEN
+	.long  MICROCODE_REGION_LENGTH
 	.long  0xFFFFFFFF - CACHE_ROM_SIZE + 1	/* Firmware Location */
 	.long  CACHE_ROM_SIZE	/* Total Firmware Length */