armv8r64-extras/kas: Merge bsp.yml into base.yml

bsp.yml contains the Kas configuration migrated from meta-arm, which
contains both bsp- and non-bsp-specific configuration. It is only
included from base.yml, so to avoid confusion merge it into base.yml
and remove the include.

Issue-Id: SCM-4386
Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Change-Id: Iece1bc92d89fd1e73866f8e4ae5bb47f082006ed