Revert "Revert "linker: get rid of the buddy allocator""

This reverts commit f9a9cda23a6afc1c2dfdfd624cde23b61941eb5e.
This revert is promised once b/5039224, b/5036755, b/5036610 are resolved.
diff --git a/linker/Android.mk b/linker/Android.mk
index abe5995..60f291c 100644
--- a/linker/Android.mk
+++ b/linker/Android.mk
@@ -8,8 +8,7 @@
 	linker_format.c \
 	rt.c \
 	dlfcn.c \
-	debugger.c \
-	ba.c
+	debugger.c
 
 ifeq ($(TARGET_ARCH),sh)
 # SH-4A series virtual address range from 0x00000000 to 0x7FFFFFFF.