Revert "Build BUILD_MULTI_PREBUILT for the prebuilt target"

This reverts commit 9bfd697cffae4b4f2bdbf122c3bbe7920525e718,
which was causing all prebuilts to be installed in all builds.

Change-Id: Ia5973b31d23bd74ec187b9e44715dea56c063efe
diff --git a/core/multi_prebuilt.mk b/core/multi_prebuilt.mk
index 00f9128..738a88d 100644
--- a/core/multi_prebuilt.mk
+++ b/core/multi_prebuilt.mk
@@ -56,7 +56,6 @@
     $(eval LOCAL_MODULE := $(basename $(notdir $(t)))) \
     $(eval LOCAL_SRC_FILES := $(t)) \
    ) \
-  $(eval ALL_PREBUILT += $(LOCAL_MODULE)) \
   $(if $(6), \
     $(eval LOCAL_BUILT_MODULE_STEM := $(6)) \
    , \