Clean-up of s3c24x0 header files

Cleans up the s3c24x0 header files:

s4c24x0.h: removes the use of 'volatile' from the S3C24X0_REG8,
S3C24X0_REG16 and S3C24X0_REG32 register typedef's. Registers are always
accessed using the IO accessor functions which cast the register address
as 'volatile' anyway so it isn't required here.

s3c2400.h and s3c2410.h: insert a blank line between the static inline
functions

Signed-off-by: Kevin Morfitt <kevin.morfitt@fearnside-systems.co.uk>