mbv: now with DDR! and a wozmon

We have access to 256 MiB of fresh DDR3.
Isn't that great?

prog.py is a bit opinionated for now:
- tty is /dev/ttyUSB1
- writing programs to DDR

mbv/Makefile

@@ -6,6 +6,10 @@ bootloader:  ## Build the bootloader in docker
 helloworld:  ## Build the helloworld app in docker
 	docker build -o . --target export --build-arg TARGET=helloworld.bin .
 
+.PHONY: wozmon
+wozmon:  ## Build the wozmon app in docker
+	docker build -o . --target export --build-arg TARGET=wozmon.bin .
+
 .PHONY: dev-image
 dev-image:
 	docker build -t mbv-dev --target dev .