util/riscvtools: Rename to util/riscv/

There's no good reason to use the more complicated name.

Change-Id: I515e2df3b87580ddd31d18fe63451a98e92ead61
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/25700
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/emulation/spike-riscv/Kconfig.name

@@ -3,5 +3,5 @@ config BOARD_EMULATION_SPIKE_UCB_RISCV
 	help
 	  To run coreboot in spike:
 	  * run "make" as usual
-	  * util/riscvtools/make-spike-elf.sh build/coreboot.{rom,elf}
+	  * util/riscv/make-spike-elf.sh build/coreboot.{rom,elf}
 	  * spike -m1024 build/coreboot.elf