juno: Add support for juno_cdcel937

This patch adds the configuration for the juno_cdcel937 on
the Juno platform.

Change-Id: Ib16253738db10b128959c9a75eaa6593cb4a58d4
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>