Build heapprofd per default.

See go/heapprofd for details. This will be used to profile the memory
usage of system services and apps.

See https://b.corp.google.com/issues/111289182#comment2 for system
health approval.

Change-Id: I2cf3af57e22c39c968afc0ca971f1d3862e27fe2
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 11f5fe4..95a87fe 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -74,6 +74,8 @@
     fsck_msdos \
     fs_config_files_system \
     fs_config_dirs_system \
+    heapprofd \
+    heapprofd_client \
     gatekeeperd \
     healthd \
     hid \