Add UCB RISCV support for architecture, soc, and emulation mainboard..

Works in the RISCV version of QEMU.

Note that the lzmadecode is so unclean that it needs a lot of work.
A cleanup is in progress.

We decided in Prague to do this as one thing, because it forms a nice case study
of the bare minimum you need to add to get a new architecture going in qemu.

Change-Id: If5af15c3a70733d219973e0d032746f8ab027e4d
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/7584
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

src/console/Kconfig

@@ -2,7 +2,7 @@ menu "Console"
 
 config BOOTBLOCK_CONSOLE
 	bool "Enable early (bootblock) console output."
-	depends on ARCH_ARM
+	depends on ARCH_ARM || ARCH_RISCV
 	default n
 	help
 	  Use console during the bootblock if supported