[style] mass reformat all the non external code to 4 space indents

Ran everything through scripts/codestyle.space, which uses astyle
to generally follow K&R style.

Biggest non whitespace change is pulling brackets down on function
declarations, which I'm pretty ambivalent about, but astyle insists
on taking a stance

top/main.c

@@ -64,7 +64,7 @@ static void call_constructors(void)
     while (ctor != &__ctor_end) {
         void (*func)(void);
 
-        func = (void (*)(void))*ctor;
+        func = (void ( *)(void))*ctor;
 
         func();
         ctor++;