fp5280g2: Add fan presence yaml config

Fp5280g2 uses GPIOs to detect fan presences.

Tested: Verified that the Present property in dbus corresponds
        correctly reflects wheather a fan is present or not.
	busctl get-property xyz.openbmc_project.Inventory.Manager
	/xyz/openbmc_project/inventory/system/chassis/motherboard/fan0
	xyz.openbmc_project.Inventory.Item Present

Signed-off-by: John Wang <wangzqbj@inspur.com>
Change-Id: I6ff5efc796fc6c1c461c029a04319e530532cb1f
2 files changed