binaryPI: Drop non-soc stoneyridge trees

These sources are no longer part of build-tests and transition
to soc/ appears to be completed.

Change-Id: I9bc2212f44d79c795e5b8f6d62b6ee3c42de779a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/20502
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
21 files changed