staging: remove unneeded static set .owner field in platform_driver

platform_driver_register will set the .owner field. So it is safe
to remove the redundant assignment.

The issue is detected with the help of Coccinelle.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Acked-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>