[bootstrap] Rename ddk-env to driver_manager-env

This makes the environment match the component, just as with fshost.

Change-Id: I4beea39678100e78eb07c541bf298ca18869d671
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/443482
Testability-Review: Abdulla Kamar <abdulla@google.com>
Reviewed-by: Gary Bressler <geb@google.com>
Commit-Queue: Abdulla Kamar <abdulla@google.com>
diff --git a/src/sys/bootstrap/meta/bootstrap.cml b/src/sys/bootstrap/meta/bootstrap.cml
index 5cccd20..50987cd9 100644
--- a/src/sys/bootstrap/meta/bootstrap.cml
+++ b/src/sys/bootstrap/meta/bootstrap.cml
@@ -11,7 +11,7 @@
         {
             name: "driver_manager",
             url: "fuchsia-boot:///#meta/driver_manager.cm",
-            environment: "#ddk-env",
+            environment: "#driver_manager-env",
         },
         {
             name: "fshost",
@@ -722,7 +722,7 @@
             __stop_timeout_ms: 1200000,
         },
         {
-            name: "ddk-env",
+            name: "driver_manager-env",
             extends: "realm",
 
             // 1 minute