Move debug symbol writing code to elf_writer_debug.cc

I want to be able to use this code without needing to
reference elf_writer_quick.

Change-Id: I87ccedc540b8f04b53be0fc6344a5947308ffcb6
diff --git a/compiler/elf_writer_debug.h b/compiler/elf_writer_debug.h
index 9ed102f..7ec0be1 100644
--- a/compiler/elf_writer_debug.h
+++ b/compiler/elf_writer_debug.h
@@ -25,14 +25,10 @@
 namespace art {
 namespace dwarf {
 
-template<typename ElfTypes>
-void WriteCFISection(ElfBuilder<ElfTypes>* builder,
-                     const ArrayRef<const MethodDebugInfo>& method_infos,
-                     CFIFormat format);
-
-template<typename ElfTypes>
-void WriteDebugSections(ElfBuilder<ElfTypes>* builder,
-                        const ArrayRef<const MethodDebugInfo>& method_infos);
+template <typename ElfTypes>
+void WriteDebugInfo(ElfBuilder<ElfTypes>* builder,
+                    const ArrayRef<const MethodDebugInfo>& method_infos,
+                    CFIFormat cfi_format);
 
 }  // namespace dwarf
 }  // namespace art