Add incident-helper-cmd build target

Add a Java binary util target incident-helper-cmd. See frameworks/base
addition (ag/10054587) for details.

Test: build
Bug: 146086597
Change-Id: Ifd202d8622e32fbd9644930cdae4d0546ce5d481
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index f49aee9..16cf77d 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -108,6 +108,7 @@
     incident \
     incidentd \
     incident_helper \
+    incident-helper-cmd \
     init.environ.rc \
     init_system \
     input \