Remove obsolete PDK build functionality

This hasn't worked for a couple years, and continues to bitrot. Just
remove it.

Test: treehugger
Change-Id: Iea6caf3c08252a560155e095135c5ddaad712991
Merged-In: Iea6caf3c08252a560155e095135c5ddaad712991
diff --git a/core/soong_app_prebuilt.mk b/core/soong_app_prebuilt.mk
index 46b16ac..b994b17 100644
--- a/core/soong_app_prebuilt.mk
+++ b/core/soong_app_prebuilt.mk
@@ -52,7 +52,7 @@
 # We skip it for unbundled app builds where we cannot build veridex.
 module_run_appcompat :=
 ifeq (true,$(non_system_module))
-ifeq (,$(TARGET_BUILD_APPS)$(filter true,$(TARGET_BUILD_PDK)))  # ! unbundled app build
+ifeq (,$(TARGET_BUILD_APPS))  # ! unbundled app build
 ifneq ($(UNSAFE_DISABLE_HIDDENAPI_FLAGS),true)
   module_run_appcompat := true
 endif