amba: store owner from modules with amba_driver_register()

Modules registering driver with amba_driver_register() often forget to
set .owner field.  The field is used by some of other kernel parts for
reference counting (try_module_get()), so it is expected that drivers
will set it.

Solve the problem by moving this task away from the drivers to the core
amba bus code, just like we did for platform_driver in
commit 9447057eaff8 ("platform_device: use a macro instead of
platform_driver_register").

Setting .owner field from the core code fixes several drivers which
forgot to initialize it.  Other drivers, which were initializing it,
can be a bit simplified and don't need their own .owner assignment.
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