EDAC/mpc85xx: Prevent building as a module

The mpc85xx EDAC driver can be configured as a module but then fails to
build because it uses two unexported symbols:

  ERROR: ".pci_find_hose_for_OF_device" [drivers/edac/mpc85xx_edac_mod.ko] undefined!
  ERROR: ".early_find_capability" [drivers/edac/mpc85xx_edac_mod.ko] undefined!

We don't want to export those symbols just for this driver, so make the
driver only configurable as a built-in.

This seems to have been broken since at least

  c92132f59806 ("edac/85xx: Add PCIe error interrupt edac support")

(Nov 2013).

 [ bp: make it depend on EDAC=y so that the EDAC core doesn't get built
   as a module. ]

Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Acked-by: Johannes Thumshirn <[email protected]>
Cc: James Morse <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: linux-edac <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

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