Remove <sys/param.h> include and assume users already include that.

Removes an include cycle when including <sys/resource.h> via:
ys/time.h, sys/timevar.h, sys/mutex.h, sys/intr.h on top of this
file, and sys/param.h, uvm/uvm_param.h, sys/resourcevar.h below.

sys/arch/arm/footbridge/footbridge_intr.h

@@ -1,4 +1,4 @@
-/* 	$NetBSD: footbridge_intr.h,v 1.20 2018/06/01 21:22:43 mrg Exp $	*/
+/* 	$NetBSD: footbridge_intr.h,v 1.21 2020/12/09 15:28:38 martin Exp $	*/
 
 /*
  * Copyright (c) 2001, 2002 Wasabi Systems, Inc.
@@ -46,7 +46,6 @@ typedef struct {
 
 #include <arm/mutex.h>
 #endif
-#include <sys/param.h>
 #include <arm/cpu.h>
 #include <arm/armreg.h>