Revert "Add adb keys to debuggable AOSP builds"

This reverts commit 6d4536023b002f6377ca6a74a93604c9a38c0670.

Reason for revert: Suspected to have broken build_test on master:

build/make/core/tasks/vendor_module_check.mk:108: error: Error: vendor module "adb_keys" in vendor/google/security/adb in product "aosp_lionhead" being installed to out/multiproduct-20171102103809/aosp_lionhead/target/product/lionhead/root/adb_keys which is not in the vendor tree or odm tree.

Change-Id: If7c1c9f08604b1dfc1036ea6fe3cb487fafc3cf0
diff --git a/target/product/full_base.mk b/target/product/full_base.mk
index 7aac435..f2652eb 100644
--- a/target/product/full_base.mk
+++ b/target/product/full_base.mk
@@ -53,6 +53,3 @@
 
 # Get everything else from the parent package
 $(call inherit-product, $(SRC_TARGET_DIR)/product/generic_no_telephony.mk)
-
-# Add adb keys to debuggable AOSP builds (if they exist)
-$(call inherit-product-if-exists, vendor/google/security/adb/vendor_key.mk)