xen: remove driver_data direct access of struct device from more drivers

In the near future, the driver core is going to not allow direct access
to the driver_data pointer in struct device.  Instead, the functions
dev_get_drvdata() and dev_set_drvdata() should be used.  These functions
have been around since the beginning, so are backwards compatible with
all older kernel versions.

Cc: [email protected]
Cc: [email protected]
Acked-by: Chris Wright <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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