Patch merged into coreboot/master: arch/riscv: Only initialize virtual memory if it's available

the following patch was just integrated into master:
commit 62bd9f93dd58e32baeddb4404fec6d04c9be3484
Author: Jonathan Neuschäfer 
Date:   Mon Jul 25 00:42:24 2016 +0200

arch/riscv: Only initialize virtual memory if it's available

And do the detection just before the initialization.

Change-Id: I9a52430262f799baa298dc4f4ea459880abe250e
    Signed-off-by: Jonathan Neuschäfer 
    Reviewed-on: https://review.coreboot.org/15831
    Tested-by: build bot (Jenkins)
    Reviewed-by: Ronald G. Minnich

See https://review.coreboot.org/15831 for details.

-gerrit