Xen: consolidate and simplify struct xenbus_driver instantiation

The 'name', 'owner', and 'mod_name' members are redundant with the
identically named fields in the 'driver' sub-structure. Rather than
switching each instance to specify these fields explicitly, introduce
a macro to simplify this.

Eliminate further redundancy by allowing the drvname argument to
DEFINE_XENBUS_DRIVER() to be blank (in which case the first entry from
the ID table will be used for .driver.name).

Also eliminate the questionable xenbus_register_{back,front}end()
wrappers - their sole remaining purpose was the checking of the
'owner' field, proper setting of which shouldn't be an issue anymore
when the macro gets used.

v2: Restore DRV_NAME for the driver name in xen-pciback.

Signed-off-by: Jan Beulich <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Dmitry Torokhov <[email protected]>
Cc: Florian Tobias Schandinat <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: David S. Miller <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>

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