Minor linker cleanup, primarily to use Elf32_Dyn

Change-Id: Ifa9408e9859c6f79444715bed4808b7c13fdced5
diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
index d9a4820..ec55159 100644
--- a/linker/linker_phdr.h
+++ b/linker/linker_phdr.h
@@ -98,7 +98,7 @@
 phdr_table_get_dynamic_section(const Elf32_Phdr* phdr_table,
                                int               phdr_count,
                                Elf32_Addr        load_bias,
-                               Elf32_Addr**      dynamic,
+                               Elf32_Dyn**       dynamic,
                                size_t*           dynamic_count,
                                Elf32_Word*       dynamic_flags);