soc/intel/apollolake: Use CPU common library code

This patch makes SOC files to use common/block/cpu/cpulib.c
file's helper functions.

Change-Id: I529c67cf20253cf819d1c13849300788104b083c
Signed-off-by: Barnali Sarkar <barnali.sarkar@intel.com>
Reviewed-on: https://review.coreboot.org/19827
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/apollolake/cpu.c

@@ -28,7 +28,9 @@
 #include <device/device.h>
 #include <device/pci.h>
 #include <fsp/api.h>
+#include <intelblocks/cpulib.h>
 #include <intelblocks/fast_spi.h>
+#include <intelblocks/msr.h>
 #include <reg_script.h>
 #include <romstage_handoff.h>
 #include <soc/cpu.h>
@@ -58,13 +60,6 @@ static const struct reg_script core_msr_script[] = {
 	REG_SCRIPT_END
 };
 
-void enable_untrusted_mode(void)
-{
-	msr_t msr = rdmsr(MSR_POWER_MISC);
-	msr.lo |= ENABLE_IA_UNTRUSTED;
-	wrmsr(MSR_POWER_MISC, msr);
-}
-
 static void soc_core_init(device_t cpu)
 {
 	/* Set core MSRs */