Revert "Add a check for apex/allowed_deps.txt to droidcore."

Revert "Track allowed transitive deps in any updatable module."

Revert submission 1312796-apex-allowed-deps

Reason for revert: b/161974327
Reverted Changes:
I52a4be72e:Add a check for apex/allowed_deps.txt to droidcore...
I56771ba3f:Track allowed transitive deps in any updatable mod...

Change-Id: I20ad7bf2001e76b5e3ca4aaf3baa5318e270f3dc
diff --git a/core/main.mk b/core/main.mk
index 68371e0..c6d2128 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1850,11 +1850,6 @@
 ndk: $(SOONG_OUT_DIR)/ndk.timestamp
 .PHONY: ndk
 
-# Checks that build/soong/apex/allowed_deps.txt remains up to date
-ifneq ($(UNSAFE_DISABLE_APEX_ALLOWED_DEPS_CHECK),true)
-  droidcore: ${APEX_ALLOWED_DEPS_CHECK}
-endif
-
 $(call dist-write-file,$(KATI_PACKAGE_MK_DIR)/dist.mk)
 
 $(info [$(call inc_and_print,subdir_makefiles_inc)/$(subdir_makefiles_total)] writing build rules ...)