rocket-tools: bump hash and build the FSF GDB, not riscv GDB

regression/Makefile

@@ -154,9 +154,9 @@ stamps/rocket-tools_checkout.stamp:
 	mkdir -p $(dir $@)
 	git -C $(abspath $(TOP)) clone -n https://github.com/freechipsproject/rocket-tools.git
 	git -C $(RISCV_TOOLS) checkout $(TOOLS_HASH)
-	git -C $(RISCV_TOOLS) submodule update --init --recursive riscv-isa-sim  riscv-tests riscv-pk riscv-openocd
+	git -C $(RISCV_TOOLS) submodule update --init --recursive riscv-isa-sim  riscv-tests riscv-pk riscv-openocd fsf-binutils-gdb
 	git -C $(RISCV_TOOLS) submodule update --init riscv-gnu-toolchain
-	git -C $(RISCV_TOOLS)/riscv-gnu-toolchain submodule update --init riscv-binutils-gdb riscv-gcc riscv-newlib
+	git -C $(RISCV_TOOLS)/riscv-gnu-toolchain submodule update --init riscv-gcc riscv-newlib
 	rm -f $(RISCV_TOOLS)/.travis.yml
 	mkdir -p $(dir $@)
 	date > $@

riscv-tools.hash

@@ -1 +1 @@
-be9e0c01374778c8b7fbbf1e3e8efc4ec709cc18
+b25b64d04311f93cb468ede56ffb1617fde3163f