ls-rcw: Bump to lf-6.1.1-1.0.0 and switch to github

ls-rcw: Bump to lf-6.1.1-1.0.0 and switch to github

The default location of ls-rcw has been changed from codeuaurora
to github. The reason is that the old codeaurora source no longer
resolves. Also use the latest tag for Layerscape Linux Development
POC from NXP.

Tested on:
  * NXP FRWY-LS1012A
  * NXP LS1046A-RDB

Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@protonmail.ch>
(reset PKG_RELEASE, Mention that previous codeaurora source is
no longer available)
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>