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/haswell_init.c

@@ -20,27 +20,6 @@
 #include "haswell.h"
 #include "chip.h"
 
-/*
- * List of supported C-states in this processor. Only the ULT parts support C8,
- * C9, and C10.
- */
-enum {
-	C_STATE_C0,             /* 0 */
-	C_STATE_C1,             /* 1 */
-	C_STATE_C1E,            /* 2 */
-	C_STATE_C3,             /* 3 */
-	C_STATE_C6_SHORT_LAT,   /* 4 */
-	C_STATE_C6_LONG_LAT,    /* 5 */
-	C_STATE_C7_SHORT_LAT,   /* 6 */
-	C_STATE_C7_LONG_LAT,    /* 7 */
-	C_STATE_C7S_SHORT_LAT,  /* 8 */
-	C_STATE_C7S_LONG_LAT,   /* 9 */
-	C_STATE_C8,             /* 10 */
-	C_STATE_C9,             /* 11 */
-	C_STATE_C10,            /* 12 */
-	NUM_C_STATES
-};
-
 #define MWAIT_RES(state, sub_state)                         \
 	{                                                   \
 		.addrl = (((state) << 4) | (sub_state)),    \