include/fs: Remove definitions of ssize_t and off_t
include/fs: Remove definitions of ssize_t and off_t

The sys/types.h definitions of ssize_t and off_t will be used.

Signed-off-by: Dominik Ermel <1a1d45a9cc0c98a37f8d0a0d2dbe3cacc0b2344f@nordicsemi.no>

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