[Zion] Remove early_dbgln since dbgln no longer allocs.

zion/debug/debug.h

@@ -6,20 +6,8 @@
 
 #include "include/ztypes.h"
 
-// Debug line without formatting for
-// before allocations are available.
-void early_dbgln(const char* str);
-
 void dbgln(const glcr::StringView& str);
 
-// TODO: Write a version of StrFormat that
-// accepts a fix-sized buffer for output
-// to use in the kernel. That way we make
-// dbgln and panic calls without allocation.
-// Optionally, add a dbgln_unbounded method for
-// things like the Debug syscall where the formatted
-// string may be fairly large.
-
 template <typename... Args>
 void dbgln(const char* str, Args... args) {
   char buffer[256];