yocto/fvp-rd-n2-automotive: Remove config after default value changes

With the latest model version some parameter defaults have changed such
that we no longer need to set them explicitly. Remove the redundant
config.

Standardize on "1" for boolean true values in the FVP config.

Issue-Id: SCM-5314
Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Change-Id: If4ec1fbaf34d2f62f9e1d0cee26e22d64d077892