[build] Change memory_layout from csv to yaml

I realized we don't need yet another format for configuration. As a
bonus, yaml also allows for a more descriptive file.

src/libraries/bootproto/bootproto.module

@@ -8,5 +8,5 @@ bp = module("bootproto",
 
 from os.path import join
 
-layout = join(source_root, "definitions/memory_layout.csv")
+layout = join(source_root, "definitions/memory_layout.yaml")
 bp.add_input("include/bootproto/memory.h.cog", deps=[layout])

src/libraries/bootproto/include/bootproto/memory.h.cog

@@ -11,7 +11,7 @@ namespace mem {
 from os.path import join
 from memory import Layout
 
-layout = Layout(join(definitions_path, "memory_layout.csv"))
+layout = Layout(join(definitions_path, "memory_layout.yaml"))
 
 for region in layout.regions:
     if region.shared: