Delete docker default systemd unit from ISO

The docker daemon initially starts up in the ISO, only to be stopped
and replaced by minikube's custom configuration.  This removes the
initial unit, so that docker doesn't automatically start up until
minikube restarts it with its configuration.

deploy/iso/minikube-iso/package/docker-bin/docker-bin.mk

@@ -42,17 +42,4 @@ define DOCKER_BIN_INSTALL_TARGET_CMDS
 		$(TARGET_DIR)/bin/docker-proxy
 endef
 
-define DOCKER_BIN_INSTALL_INIT_SYSTEMD
-	$(INSTALL) -D -m 644 \
-		$(BR2_EXTERNAL_MINIKUBE_PATH)/package/docker-bin/docker.service \
-		$(TARGET_DIR)/usr/lib/systemd/system/docker.service
-
-	$(INSTALL) -D -m 644 \
-		$(BR2_EXTERNAL_MINIKUBE_PATH)/package/docker-bin/docker.socket \
-		$(TARGET_DIR)/usr/lib/systemd/system/docker.socket
-
-	ln -fs /usr/lib/systemd/system/docker.service \
-		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/docker.service
-endef
-
 $(eval $(generic-package))