mb/lowrisc: Remove the Nexys4DDR port

This board doesn't support the newest RISC-V Privileged Architecture
spec (1.10), and it's based on an FPGA so it's a moving target.

Now that there's actual RISC-V silicon out there (from SiFive),
mb/lowrisc/nexys4ddr will only continue to bitrot.

Change-Id: I4e3e715106a1a94381a563dc4a56781c35883c2d
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/28706
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Hug <philipp@hug.cx>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

0 files changed, 0 insertions, 0 deletions