Merge cpu/intel/acpi.h into cpu/intel/speedstep.h

We had only some MSR definitions in there, which are used in speedstep
related code. I think speedstep.h is the better and less confusing place
for these.

Change-Id: I1eddea72c1e2d3b2f651468b08b3c6f88b713149
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/1655
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/cpu/intel/speedstep.h

@@ -32,3 +32,10 @@
  */
 #define PMB1_BASE 0x800
 
+
+/* Speedstep related MSRs */
+#define IA32_PLATFORM_ID  0x017
+#define IA32_PERF_STS     0x198
+#define IA32_PERF_CTL     0x199
+#define MSR_THERM2_CTL    0x19D
+#define IA32_MISC_ENABLES 0x1A0