Use BUILD_PREBUILT to install the cmds.

Change-Id: Idd7308d653653387ee3ff4384ee428bc3c663c8b
diff --git a/core/legacy_prebuilts.mk b/core/legacy_prebuilts.mk
index fbdb3b7..d0ec83d 100644
--- a/core/legacy_prebuilts.mk
+++ b/core/legacy_prebuilts.mk
@@ -23,7 +23,6 @@
 
 GRANDFATHERED_ALL_PREBUILT := \
 	akmd2 \
-	am \
 	ap_gain.bin \
 	AVRCP.kl \
 	batch \
@@ -34,7 +33,6 @@
 	bypassfactory \
 	cdt.bin \
 	chat-ril \
-	content \
 	cpcap-key.kl \
 	data \
 	dbus.conf \
diff --git a/target/product/base.mk b/target/product/base.mk
index 609f0cc..393f820 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -105,7 +105,5 @@
     webview \
     wm
 
-PRODUCT_COPY_FILES += \
-    frameworks/base/cmds/wm/wm:system/bin/wm \
 
 $(call inherit-product, $(SRC_TARGET_DIR)/product/embedded.mk)