Require the ARM Generic Timer driver is built for MULTIDELAY on 32bit arm.

As this driver is also used for DELAY on arm64 we need to keep the existing
DELAY code for it to use.

sys/arm/arm/generic_timer.c

@@ -57,7 +57,7 @@ __FBSDID("$FreeBSD$");
 #include <machine/intr.h>
 #include <machine/md_var.h>
 
-#ifdef MULTIDELAY
+#if defined(__arm__)
 #include <machine/machdep.h> /* For arm_set_delay */
 #endif
 
@@ -72,6 +72,10 @@ __FBSDID("$FreeBSD$");
 #include <dev/acpica/acpivar.h>
 #endif
 
+#if defined(__arm__) && !defined(MULTIDELAY)
+#error The generic timer requires MULTIDELAY on 32bit arm
+#endif
+
 #define	GT_CTRL_ENABLE		(1 << 0)
 #define	GT_CTRL_INT_MASK	(1 << 1)
 #define	GT_CTRL_INT_STAT	(1 << 2)
@@ -427,7 +431,7 @@ arm_tmr_attach(device_t dev)
 	sc->et.et_priv = sc;
 	et_register(&sc->et);
 
-#ifdef MULTIDELAY
+#if defined(__arm__)
 	arm_set_delay(arm_tmr_do_delay, sc);
 #endif
 
@@ -505,7 +509,7 @@ arm_tmr_do_delay(int usec, void *arg)
 	}
 }
 
-#ifndef MULTIDELAY
+#if defined(__aarch64__)
 void
 DELAY(int usec)
 {

sys/arm/conf/EXYNOS5.common

@@ -23,6 +23,7 @@ makeoptions	WERROR="-Werror"
 include 	"std.armv6"
 options 	SCHED_ULE		# ULE scheduler
 options 	PLATFORM		# Platform based SoC
+options 	MULTIDELAY
 options 	PREEMPTION		# Enable kernel thread preemption
 options 	INET			# InterNETworking
 options 	INET6			# IPv6 communications protocols