crossgcc: Add RISC-V support

Change-Id: If1e0f7ed21f67d7a185dad251ede81ddbc18c4e5
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/8629
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
5 files changed