EC2: Specify RAM size in GiB
EC2: Specify RAM size in GiB

The values on <https://aws.amazon.com/ec2/instance-types/?nc1=f_ls> are
given in [GiB].

Let Python convert them to [MiB], as the current values are a mix of
[MB] and [MiB].

Signed-off-by: Anthony Shaw <1bb2a1c4994a69c577688ea8868f94e36f081e42@gmail.com>

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