juno: Add support for juno_hdlcd

This patch adds the configuration for the juno_hdlcd module
on Juno platform.

Change-Id: Iba6ec5c292c3ba89cd334e8ca2a9fe0ee8e1b658
Signed-off-by: Elieva Pignat <Elieva.Pignat@arm.com>
Signed-off-by: Jim Quigley <jim.quigley@arm.com>
Signed-off-by: Raphael Gault <raphael.gault@arm.com>
Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>