soc/intel/common: Bring DISPLAY_MTRRS into the light

Initially, I wanted to move only the Kconfig DISPLAY_MTRRS into the
"Debug" menu. It turned out, though, that the code looks rather generic.
No need to hide it in soc/intel/.

To not bloat src/Kconfig up any further, start a new `Kconfig.debug`
hierarchy just for debug options.

If somebody wants to review the code if it's 100% generic, we could
even get rid of HAVE_DISPLAY_MTRRS.

Change-Id: Ibd0a64121bd6e4ab5d7fd835f3ac25d3f5011f24
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/29684
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/drivers/intel/fsp1_1/car.c b/src/drivers/intel/fsp1_1/car.c
index 4016ba1..13161d6 100644
--- a/src/drivers/intel/fsp1_1/car.c
+++ b/src/drivers/intel/fsp1_1/car.c
@@ -15,10 +15,10 @@
 
 #include <arch/early_variables.h>
 #include <console/console.h>
+#include <cpu/x86/mtrr.h>
 #include <fsp/car.h>
 #include <fsp/util.h>
 #include <program_loading.h>
-#include <soc/intel/common/util.h>
 #include <timestamp.h>
 
 FSP_INFO_HEADER *fih_car CAR_GLOBAL;
@@ -95,7 +95,7 @@
 {
 	timestamp_add_now(TS_FSP_TEMP_RAM_EXIT_END);
 	printk(BIOS_DEBUG, "FspTempRamExit returned successfully\n");
-	soc_display_mtrrs();
+	display_mtrrs();
 
 	after_cache_as_ram_stage();
 }