Use Android.soong.mk to handle mixed Android.mk and Android.bp dirs

When building with soong Android.mk files are ignored in directories
that have Android.bp files.  Only parts of bionic have been converted to
Android.bp files, including some directories that have subdirectories
with Android.mk files.

Add Android.soong.mk files to include subdirectories to any directory
that has an Android.bp file but also has subdirectories with only
Android.mk files.

Change-Id: Ibd3c27d51c44f7a4b42dad0bc747e357b4ae34ca

Android.bp

@@ -0,0 +1,2 @@
+subdirs = ["*"]
+

Android.mk

@@ -16,5 +16,4 @@
 
 LOCAL_PATH := $(call my-dir)
 
-include $(call all-makefiles-under,$(LOCAL_PATH)) \
-	$(call all-makefiles-under,$(LOCAL_PATH)/libc)
+include $(call all-makefiles-under,$(LOCAL_PATH))

Android.soong.mk

@@ -0,0 +1,4 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(call all-makefiles-under,$(LOCAL_PATH))
+

libc/Android.mk

@@ -1477,3 +1477,5 @@ LOCAL_SYSTEM_SHARED_LIBRARIES := libc
 LOCAL_SANITIZE := never
 LOCAL_NATIVE_COVERAGE := $(bionic_coverage)
 include $(BUILD_STATIC_LIBRARY)
+
+include $(call all-makefiles-under,$(LOCAL_PATH))

libc/Android.soong.mk

@@ -0,0 +1,4 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(call all-makefiles-under,$(LOCAL_PATH))
+