make aws default docker registry in remaining scripts

AWS has much better anonymous pull request limits (1 per second) vs
docker hub which is 100 per 6 hours per IP address. A lot of our CI and
development occurs on shared systems so it's easy to exceed this limit
on an IP basis.

Tested:
- Verified no setting for DOCKER_REG and a setting of docker.io work as
  expected within these scripts

Change-Id: Ic5cb5ee07ee83567b6cf26754b6d1045025bdd65
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/scripts/build-qemu-robot-docker.sh b/scripts/build-qemu-robot-docker.sh
index c8e402a..4517ffd 100755
--- a/scripts/build-qemu-robot-docker.sh
+++ b/scripts/build-qemu-robot-docker.sh
@@ -9,9 +9,8 @@
 #  PIP_MIRROR:       <optional, the URL of a PIP mirror>
 #                    default is empty, and no mirror is used.
 #  DOCKER_REG:       <optional, the URL of a docker registry to utilize
-#                    instead of the default docker hub
-#                    (ex. public.ecr.aws/ubuntu)
-#
+#                    instead of our default (public.ecr.aws/ubuntu)
+#                    (ex. docker.io)
 #  Parameters:
 #   parm1:  <optional, the name of the docker image to generate>
 #            default is openbmc/ubuntu-robot-qemu
@@ -25,7 +24,7 @@
 DISTRO=${2:-"ubuntu:jammy"}
 UBUNTU_MIRROR=${UBUNTU_MIRROR:-""}
 PIP_MIRROR=${PIP_MIRROR:-""}
-docker_reg=${DOCKER_REG:-"docker.io"}
+docker_reg=${DOCKER_REG:-"public.ecr.aws/ubuntu"}
 
 MIRROR=""
 if [[ -n "${UBUNTU_MIRROR}" ]]; then