EDAC/amd64: Support asymmetric dual-rank DIMMs

Future AMD systems will support asymmetric dual-rank DIMMs. These are
DIMMs where the ranks are of different sizes.

The even rank will use the Primary Even Chip Select registers and the
odd rank will use the Secondary Odd Chip Select registers.

Recognize if a Secondary Odd Chip Select is being used. Use the
Secondary Odd Address Mask when calculating the chip select size.

 [ bp: move csrow_sec_enabled() to the header, fix CS_ODD define and
   tone-down the capitalized words spelling. ]

Signed-off-by: Yazen Ghannam <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: "[email protected]" <[email protected]>
Cc: James Morse <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Tony Luck <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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