[Zion/Mammoth] Move init cap decls to mammoth.

They no longer need to be independent now that we have removed the libc.

sys/teton/terminal.cpp

@@ -4,7 +4,7 @@
 #include <glacier/string/str_split.h>
 #include <mammoth/file/file.h>
 #include <mammoth/proc/process.h>
-#include <zglobal.h>
+#include <mammoth/util/init.h>
 
 void Terminal::HandleCharacter(char c) {
   console_.WriteChar(c);

sys/yellowstone/hw/gpt.cpp

@@ -5,7 +5,6 @@
 #include <mammoth/util/debug.h>
 #include <mammoth/util/memory_region.h>
 #include <zcall.h>
-#include <zglobal.h>
 
 #define GPT_DEBUG 0