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Add the support of AARCH32 in endian head file. The code is also
imported from FreeBSD 11.0. It's based on commit in below.

commit 4e3a5b429989b4ff621682ff1462f801237bd551
Author: mmel <mmel@FreeBSD.org>
Date:   Tue Nov 10 12:02:41 2015 +0000

    ARM: Remove trailing whitespace from sys/arm/include
    No functional changes.

    Approved by:    kib (mentor)
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

Import endian head files from FreeBSD 11.0. The link of FreeBSD source code
is https://github.com/freebsd/freebsd



Import machine/endian.h from sys/arm64/include/endian.h in FreeBSD.
commit d09ff72cef8e35dbf62f7363dcbf07b453f06243
Author: andrew <andrew@FreeBSD.org>
Date:   Mon Mar 23 11:54:56 2015 +0000

    Add the start of the arm64 machine headers. This is the subset needed to
    start getting userland libraries building.

    Reviewed by:        imp
    Sponsored by:       The FreeBSD Foundation

Import sys/endian.h from sys/sys/endian.h in FreeBSD.
commit 3c3fa2f5b0c7640373fcbcc3f667bf7794e8e609
Author: phk <phk@FreeBSD.org>
Date:   Thu May 20 06:16:13 2010 +0000

    Fix some way-past-brucification complaints from FlexeLint.
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

To make software license auditing simpler, use SPDX[0] license
identifiers instead of duplicating the license text in every file.

NOTE: Files that have been imported by FreeBSD have not been modified.

[0]: https://spdx.org/



Change-Id: I80a00e1f641b8cc075ca5a95b10607ed9ed8761a
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

This patch adds the essential AArch32 architecture helpers
arch.h and arch_helpers.h and modifies `_types.h` to add AArch32
support.

A new build option `ARCH` is defined in the top level makefile to
enable the component makefiles to choose the right files based on the
Architecture it is being build for. Depending on this flag, either
`AARCH32` or `AARCH64` flag is defined by the Makefile. The default
value of `ARCH` flag is `aarch64`. The AArch32 build support will be
added in a later patch.

Change-Id: I405e5fac02db828a55cd25989b572b64cb005241

This patch reworks type usage in generic code, drivers and ARM platform files
to make it more portable. The major changes done with respect to
type usage are as listed below:

* Use uintptr_t for storing address instead of uint64_t or unsigned long.
* Review usage of unsigned long as it can no longer be assumed to be 64 bit.
* Use u_register_t for register values whose width varies depending on
  whether AArch64 or AArch32.
* Use generic C types where-ever possible.

In addition to the above changes, this patch also modifies format specifiers
in print invocations so that they are AArch64/AArch32 agnostic. Only files
related to upcoming feature development have been reworked.

Change-Id: I9f8c78347c5a52ba7027ff389791f1dad63ee5f8

* Move stdlib header files from include/stdlib to include/lib/stdlib for
  consistency with other library headers.
* Fix checkpatch paths to continue excluding stdlib files.
* Create stdlib.mk to define the stdlib source files and include directories.
* Include stdlib.mk from the top level Makefile.
* Update stdlib header path in the fip_create Makefile.
* Update porting-guide.md with the new paths.

Change-Id: Ia92c2dc572e9efb54a783e306b5ceb2ce24d27fa