Refactoring: rename linker_allocator files

Change-Id: Ifc08e64b3a85205f072b7abab1149c7ab71e2f75
diff --git a/linker/Android.mk b/linker/Android.mk
index 54535fc..0ab0fda 100644
--- a/linker/Android.mk
+++ b/linker/Android.mk
@@ -6,7 +6,7 @@
     debugger.cpp \
     dlfcn.cpp \
     linker.cpp \
-    linker_allocator.cpp \
+    linker_block_allocator.cpp \
     linker_environ.cpp \
     linker_libc_support.c \
     linker_phdr.cpp \