infra: add additional port parameters for ns console port

Add 'flow_ctrl_mask_en' and 'enable_dc4' parameters for the non-secure
console port. This is required to allow key inputs with WinPE.

Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: Id5925a8edd0815cee24125ea422b1594324cb6f6