EDAC/altera: Add separate SDRAM EDAC config

The CONFIG_ALTERA_EDAC Kconfig symbol always enables the SDRAM EDAC
functionality. On the newer architectures, however, there are cases
where the peripheral EDAC functionality is enabled but SDRAM needs to be
disabled.

Move SDRAM functions so they can be contained inside the conditional
CONFIG. Create new CONFIG option just for SDRAM.

 [ bp: Massage commit message. ]

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

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