Use machine header file for endianness configuration.

Use machine header file for endianness configuration.

newlib/ChangeLog:
2015-07-28  Andre Vieira  <andre.simoesdiasvieira@arm.com>

   * libc/sys/arm/sys/param.h (BIG_ENDIAN, LITTLE_ENDIAN): Moved
   to machine/endian.h.
   * libc/machine/arm/machine/param.h (BYTE_ORDER): Idem.
   * libc/machine/arm/machine/endian.h: New.

From ca6efccda91bc6b620b7d96a466b0f1e2f02cfeb Mon Sep 17 00:00:00 2001
From: Andre Simoes Dias Vieira <andsim01@arm.com>
Date: Tue, 28 Jul 2015 12:16:20 +0100
Subject: [PATCH 2/2] Move endianness configuration to machine/endian.h