Build "secdiscard" for securely discarding data from flash devices.

Bug: 19706593
Change-Id: I073b7b39f25b054abdf2b983a63d029d690970a9
diff --git a/target/product/base.mk b/target/product/base.mk
index f738fe5..bf45acc 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -113,6 +113,7 @@
     run-as \
     schedtest \
     sdcard \
+    secdiscard \
     services \
     settings \
     sgdisk \