armv8r64-extras/kas: Remove dependency on meta-arm Kas file

There is a bug in Kas which means that a repo URL cannot be overridden
(e.g. to use an internal mirror) if the original repo definition is a
local layer. Therefore migrate the contents of
kas/fvp-baser-aemv8r64-bsp.yml in meta-arm to
meta-armv8r64-extras/kas/include/bsp.yml

Issue-Id: SCM-4386
Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Change-Id: I184ddade69b712f8709e81ea56c64baf56936806