Add snapshotctl to base system

Test: build and check output
Bug: 135752105
Change-Id: I229fd03994e7145b9e05452c4d564379c53d8a61
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 176fd59..548f5aa 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -244,6 +244,7 @@
     Shell \
     shell_and_utilities_system \
     sm \
+    snapshotctl \
     SoundPicker \
     statsd \
     storaged \