cpu/intel/haswell/acpi.c: Use C-state enum definitions

Tested with BUILD_TIMELESS=1, Asrock B85M Pro4 does not change.

Change-Id: I0ca98cbe45e10d233607f68923f08752fdda9698
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46923
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/haswell/acpi.c

@@ -15,15 +15,15 @@
 #include <southbridge/intel/lynxpoint/pch.h>
 
 static int cstate_set_lp[3] = {
-	2,
-	3,
-	9,
+	C_STATE_C1E,
+	C_STATE_C3,
+	C_STATE_C7S_LONG_LAT,
 };
 
 static int cstate_set_trad[3] = {
-	1,
-	3,
-	5,
+	C_STATE_C1,
+	C_STATE_C3,
+	C_STATE_C6_LONG_LAT,
 };
 
 static int get_cores_per_package(void)