[ARM] S3C24XX: Documentation: update platform docs

  Support for the S3C2400 series is in progress.

Configuration

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  Register, kernel and platform data definitions are held in the

  arch/arm/mach-s3c2410 directory./include/mach

arch/arm/plat-s3c24xx:

  Files in here are either common to all the s3c24xx family,

  or are common to only some of them with names to indicate this

  status. The files that are not common to all are generally named

  with the initial cpu they support in the series to ensure a short

  name without any possibility of confusion with newer devices.

  As an example, initially s3c244x would cover s3c2440 and s3c2442, but

  with the s3c2443 which does not share many of the same drivers in

  this directory, the name becomes invalid. We stick to s3c2440-<x>

  to indicate a driver that is s3c2440 and s3c2442 compatible.

  This does mean that to find the status of any given SoC, a number

  of directories may need to be searched.

Machines

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