gn2bp: change update_results.sh to build //base:base

Removing other targets as they are all contained within //base:base.
Although //base:base does not successfully build yet, it does succeed in
building an Android.bp file seeing changes reflected in a larger group
of targets is valuable.

Test: none
Change-Id: I328bff0fb4eb17d2020f72c8afdeebfc1bcfedfd
diff --git a/tools/gn2bp/update_results.sh b/tools/gn2bp/update_results.sh
index 6b46ea2..6f90a69 100755
--- a/tools/gn2bp/update_results.sh
+++ b/tools/gn2bp/update_results.sh
@@ -12,10 +12,7 @@
 set -eux
 
 TARGETS=(
-  "//third_party/zlib:zlib"
-  "//third_party/libevent:libevent"
-  "//base:base_static"
-  "//base:build_date"
+  "//base:base"
 )
 
 BASEDIR=$(dirname "$0")