fp5280g2: Fix FRU property interfaces

Add a specific interface for the Cpu and Dimm`s FRU properties and find
all Cpu and Dimm`s paths below the `/xyz/openbmc_project/inventory` path
thought this interface.

Testd: Saw the addition of `xyz.openbmc_project.Inventory.Item.Cpu` or
`xyz.openbmc_project.Inventory.Item.Dimm` interfaces via the D-Bus command.
busctl introspect xyz.openbmc_project.Inventory.Manager
/system/chassis/motherboard/cpu*
or
busctl introspect xyz.openbmc_project.Inventory.Manager
/system/chassis/motherboard/dimm*.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: If037f6ad7535d0182151cb8b2076c156865ea66b
1 file changed