sdio: enhance IO_RW_EXTENDED support

These three patches enhance the support for the SDIO IO_RW_EXTENDED command.
The block size of functions is managed and the I/O ops (sdio_readsb() etc) are
extended to handle arbitrary lengths of data (by using multiple commands).

I've not yet had a chance to test this stuff as I don't (yet) have the time to
write a Bluetooth Type-A driver so these are posted as an example of the sort
of API I'd expect.

David
-- 
David Vrabel, Software Engineer, Drivers group Tel: +44 (0)1223 692562
CSR plc, Churchill House, Cambridge Business Park, Cowley Road, CB4 0WZ 
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