Remove ping.

This is being done to clear the way for NO_NEW_PRIVS.

Change-Id: I3f642de5c1a1febfe4db39406f3ef15b99482993
diff --git a/target/product/base.mk b/target/product/base.mk
index 393f820..7d8c684 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -86,7 +86,6 @@
     ndc \
     netcfg \
     netd \
-    ping \
     platform.xml \
     pppd \
     pm \