Add throughput mode elastic for efs

[ruoibmt]

Summary

Missing throughput mode="elastic" when creating efs volume.
Refer AWS document: https://docs.aws.amazon.com/efs/latest/ug/performance.html#throughput-modes

Issue Type

Bug Report

Component Name

community.aws.efs

Additional Information

Code of Conduct

• I agree to follow the Ansible Code of Conduct

[ruoibmt]

#2002