[init] Go back to boot modules having inline data

In order to pass along arguments like the framebuffer, it's far simpler
to have that data stored along with the modules than mapping new pages
for every structure. Also now optionally pass a module's data to a
driver as init starts it.

src/boot/loader.h

@@ -60,14 +60,12 @@ load_program(
 /// \arg name    The human-readable name of the module
 /// \arg path    The path of the file to load the module from
 /// \arg type    The major type to set on the module
-/// \arg subtype The subtype to set on the module
 void
 load_module(
     fs::file &disk,
     const wchar_t *name,
     const wchar_t *path,
-    bootproto::module_type type,
-    uint16_t subtype);
+    bootproto::module_type type);
 
 } // namespace loader
 } // namespace boot