[ARM] S3C64XX: Fix warnings from map_io initilaisers

Discard the 'void *' from the pointers used for the
virtual addresses when setting up the .virtual fields
of the io map to avoid implicit cast warnings

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
 Index: linux.git/arch/arm/plat-s3c64xx/cpu.c
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