ArmPlatformPkg: Move the FDT platform driver at the end of the driver list

ArmPlatformPkg: Move the FDT platform driver at the end of the driver list

The Fdt platform driver has been moved at the end of the list
of the DXE/UEFI drivers to ensure the device drivers have been
dispatched prior to load the FDT platform driver.

For instance, if we want to load FDT from TFTP we must have
the ethernet driver to be already loaded.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Ronald Cron <Ronald.Cron@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17305 6f19259b-4bc3-4df7-8a09-765794883524