[arm] remove libc/sys/arm/sys/param.h

The Arm sys/param.h does not define anything differently to the
generic sys/param.h, but fails to define some things that that file
provides.  There does not appear to be any reason to keep this version
and we should revert to using the common version.

newlib/libc/sys/arm/sys/param.h

@@ -1,25 +0,0 @@
-/* ARM configuration file; HZ is 100 rather than the default 60 */
-
-#ifndef _SYS_PARAM_H
-# define _SYS_PARAM_H
-
-#include <machine/param.h>
-#include <machine/endian.h>
-
-#ifndef NBBY
-# define NBBY 8		/* number of bits in a byte */
-#endif
-#ifndef HZ
-# define HZ (60)
-#endif
-#ifndef NOFILE
-# define NOFILE (60)
-#endif
-#ifndef PATHSIZE
-# define PATHSIZE (1024)
-#endif
-
-#define MAX(a,b) ((a) > (b) ? (a) : (b))
-#define MIN(a,b) ((a) < (b) ? (a) : (b))
-
-#endif