[SCSI] 3ware 9000 add big endian support

The attached patch updates the 3ware 9000 driver:

- Fix 9550SX pchip reset timeout.
- Add big endian support.

Signed-off-by: Adam Radford <linuxraid@amcc.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>