provider/aws: Enable DynamoDB Table to output stream_arm when streams are enabled

[stack72]

Fixes #5266

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSDynamoDbTable' 2>~/tf.log
==> Checking that code complies with gofmt requirements...
GO15VENDOREXPERIMENT=1 go generate $(GO15VENDOREXPERIMENT=1 go list ./... | grep -v /vendor/)
TF_ACC=1 GO15VENDOREXPERIMENT=1 go test ./builtin/providers/aws -v -run=TestAccAWSDynamoDbTable -timeout 120m
=== RUN   TestAccAWSDynamoDbTable_basic
--- PASS: TestAccAWSDynamoDbTable_basic (325.21s)
=== RUN   TestAccAWSDynamoDbTable_streamSpecification
--- PASS: TestAccAWSDynamoDbTable_streamSpecification (33.70s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    358.925s

[phinze]

LGTM!

[ghost]

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