Clean up unused arch/early_variables.h header

Change-Id: Ib863e23863ba6d7504b6c4d32de2f1fea4e57fec
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32996
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/drivers/intel/fsp1_1/car.c

@@ -13,7 +13,7 @@
  * GNU General Public License for more details.
  */
 
-#include <arch/early_variables.h>
+#include <arch/symbols.h>
 #include <console/console.h>
 #include <cpu/x86/mtrr.h>
 #include <fsp/car.h>

src/drivers/intel/fsp1_1/hob.c

@@ -14,7 +14,6 @@
  * GNU General Public License for more details.
  */
 
-#include <arch/early_variables.h>
 #include <arch/hlt.h>
 #include <bootstate.h>
 #include <console/console.h>

src/drivers/intel/fsp1_1/romstage.c

@@ -18,7 +18,6 @@
 #include <stddef.h>
 #include <arch/acpi.h>
 #include <arch/cbfs.h>
-#include <arch/early_variables.h>
 #include <assert.h>
 #include <console/console.h>
 #include <cbmem.h>