layerscape: update packages with LSDK git trees

layerscape: update packages with LSDK git trees

NXP Layerscape LSDK had set up its own open source web site
and github for release.

https://lsdk.github.io
https://github.com/qoriq-open-source

This patch is to update rcw/fman_ucode/u-boot packages with LSDK
git trees. Also add some patches of packages to support LEDE.
Since ARMv8 32-bit u-boot images are same with ARMv8 64-bit images
but 64-bit toolchain couldn't be used for 32-bit targets, we still
use a private tree for ARMv8 32-bit u-boot images. This is in plan
to move this private tree to NXP Layerscape github.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>