Update path to package template

Change-Id: I65b28a387ada486086d74bb2aa0253e1b76d95e0

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
index 9f3c194..416c2af 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -26,7 +26,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import("//packages/package.gni")
+import("//build/package.gni")
 
 package("git") {
   system_image = true