fvp-docker-images: only build used FVP docker image

Only create the FVP docker images that are currently
used in TF-A, or TF-M.[1]

[1]: https://linaro.atlassian.net/browse/TFC-732

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I26b18cb77d9916943667a0f650c63aa574bd1f9d
2 files changed