Remove unused Android.mk under bionic

Bug: b/311284462
Test: CIs
Change-Id: I2586c425616ef59dbf2ba88fe1cbaa75a3bc2d5c
diff --git a/Android.mk b/Android.mk
deleted file mode 100644
index 888404c..0000000
--- a/Android.mk
+++ /dev/null
@@ -1,4 +0,0 @@
-LOCAL_PATH := $(call my-dir)
-
-include $(call all-makefiles-under,$(LOCAL_PATH))
-