4MB to 16MB

Increase max transfer support from 4MB to 16MB.
This is done by changing the shost->max_sector from 8192 to 32767

Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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