Replace hlt with halt()

There were instances of unneeded arch/hlt.h includes,
various hlt() calls that weren't supposed to exit (but
might have) and various forms of endless loops around
hlt() calls.

All these are sorted out now: unnecessary includes are
dropped, hlt() is uniformly replaced with halt() (except
in assembly, obviously).

Change-Id: I3d38fed6e8d67a28fdeb17be803d8c4b62d383c5
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/7608
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/soc/intel/baytrail/smihandler.c

@@ -19,13 +19,13 @@
 
 #include <stdint.h>
 #include <stdlib.h>
-#include <arch/hlt.h>
 #include <arch/io.h>
 #include <console/console.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/smm.h>
 #include <device/pci_def.h>
 #include <elog.h>
+#include <halt.h>
 
 #include <baytrail/pci_devs.h>
 #include <baytrail/pmc.h>
@@ -161,7 +161,7 @@ static void southbridge_smi_sleep(void)
 
 	/* Make sure to stop executing code here for S3/S4/S5 */
 	if (slp_typ > 1)
-		hlt();
+		halt();
 
 	/* In most sleep states, the code flow of this function ends at
 	 * the line above. However, if we entered sleep state S1 and wake