Propagate Soong header_libs to module-info.json

Adding the Soong header_libs dependencies to
module-info.json allows tools to more accurately detect
all module-level dependencies. This change adds
LOCAL_HEADER_LIBRARIES, populated from header_libs, to
the Soong's Android.mk prebulit module definition so
that it will propagate through the prebuilt into
base_rules.mk and eventually to module-info.json.

Bug: 151755703
Test: Find header_libs deps in module-info.json
Change-Id: Ic7134d33fa71822aae548ca097851dc0c1371bad
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 5438b14..671adb5 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -92,6 +92,9 @@
 				if len(c.Properties.AndroidMkWholeStaticLibs) > 0 {
 					entries.AddStrings("LOCAL_WHOLE_STATIC_LIBRARIES", c.Properties.AndroidMkWholeStaticLibs...)
 				}
+				if len(c.Properties.AndroidMkHeaderLibs) > 0 {
+					entries.AddStrings("LOCAL_HEADER_LIBRARIES", c.Properties.AndroidMkHeaderLibs...)
+				}
 				entries.SetString("LOCAL_SOONG_LINK_TYPE", c.makeLinkType)
 				if c.UseVndk() {
 					entries.SetBool("LOCAL_USE_VNDK", true)