cpu/intel: Get rid of device_t

Use of `device_t` has been abandoned in ramstage.

Change-Id: I17675b004023453f137abd387cfacd308d9b98b5
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/23652
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/cpu/intel/speedstep/acpi.c

@@ -113,7 +113,7 @@ static void gen_pstate_entries(const sst_table_t *const pstates,
 /**
  * @brief Generate ACPI entries for Speedstep for each cpu
  */
-void generate_cpu_entries(device_t device)
+void generate_cpu_entries(struct device *device)
 {
 	int coreID, cpuID, pcontrol_blk = PMB0_BASE, plen = 6;
 	int totalcores = determine_total_number_of_cores();