soc/intel/cnl: Add config to disable IME

Replace hard-coded define with a Kconfig option. Default to true to
preserve current beahvior.

Change-Id: I684470c831bcc03a4d4f78e22367a88dc2e3def6

src/soc/intel/cannonlake/Kconfig

@@ -358,4 +358,8 @@ config INTEL_GMA_BCLM_OFFSET
 config INTEL_GMA_BCLM_WIDTH
 	default 32
 
+config DISABLE_ME
+	bool "Disable the IME by setting the HAP bit at run-time"
+	default y
+
 endif

src/soc/intel/cannonlake/me.c

@@ -154,8 +154,7 @@ void dump_me_status(void *unused)
 		hfsts6.fields.txt_support ? "YES" : "NO");
 }
 
-#define DISABLE_ME 1
+#if CONFIG(DISABLE_ME)
-#if DISABLE_ME
 
 static void disable_me(void* unused)
 {