liberate wdog_kern_pat call from SW_WATCHDOG in arm minimdump code

Obviosuly, there are hardware watchdogs on arm.

MFC after:	1 week

sys/arm/arm/minidump_machdep.c

@@ -41,9 +41,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/kernel.h>
 #include <sys/kerneldump.h>
 #include <sys/msgbuf.h>
-#ifdef SW_WATCHDOG
 #include <sys/watchdog.h>
-#endif
 #include <vm/vm.h>
 #include <vm/vm_param.h>
 #include <vm/vm_page.h>
@@ -114,9 +112,8 @@ blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
 			len = sz;
 
 		dumpsys_pb_progress(len);
-#ifdef SW_WATCHDOG
 		wdog_kern_pat(WD_LASTVAL);
-#endif
+
 		if (ptr) {
 			error = dump_append(di, ptr, 0, len);
 			if (error)