Platform/Comcast: Use FdtClientDxe from EmbeddedPkg
Compliant with BZ: #3665
https://bugzilla.tianocore.org/show_bug.cgi?id=3665
FdtClientDxe is relocated to under EmbeddedPkg.
Signed-off-by: Abner Chang <abner.chang@hpe.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Daniel Schaefer <daniel.schaefer@hpe.com>
Acked-by: Leif Lindholm <leif@nuviainc.com>