SPDX: Convert all of our single license tags to Linux Kernel style

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>

Fix FreeBSD loader API so that it works on both 32-bit and 64-bit targets.

Specifically tested on MIPS under QEMU (works with all combination of bit-ness and endian-ness)

Signed-off-by: Stanislav Galabov <sgalabov@gmail.com>

api: Add FreeBSD API support for MIPS platforms

This patch adds U-Boot API support (used by FreeBSD loader) for MIPS platforms.

Signed-off-by: Stanislav Galabov <sgalabov@gmail.com>

Add GPL-2.0+ SPDX-License-Identifier to source files

Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>

Move api_examples to examples/api

Also add a rule to remove demo.bin which was previously leftover
after a "make clean"

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>