Patch merged into coreboot/master: arch/riscv: Implement the SBI again

the following patch was just integrated into master:
commit 857e33e27f1feeec328ae8be5ad61ee51b75e4ec
Author: Jonathan Neuschäfer 
Date:   Mon Aug 22 19:37:16 2016 +0200

arch/riscv: Implement the SBI again

Not all SBI calls are implemented, but it's enough to see a couple dozen
    lines of Linux boot output.

It should also be noted that the SBI is still in flux:
    https://groups.google.com/a/groups.riscv.org/forum/#!topic/sw-dev/6oNhlW0OFK...

Change-Id: I80e4fe508336d6428ca7136bc388fbc3cda4f1e4
    Signed-off-by: Jonathan Neuschäfer 
    Reviewed-on: https://review.coreboot.org/16119
    Tested-by: build bot (Jenkins)
    Reviewed-by: Ronald G. Minnich

See https://review.coreboot.org/16119 for details.

-gerrit