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 <[e-mail]>
Acked-by: Vaibhav Agarwal <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/greybus/audio_codec.c

···
 static struct platform_driver gbaudio_codec_driver = {
 	.driver = {
 		.name = "apb-dummy-codec",
-		.owner = THIS_MODULE,
 #ifdef CONFIG_PM
 		.pm = &gbaudio_codec_pm_ops,
 #endif

drivers/staging/mt7621-eth/gsw_mt7621.c

···
 	.remove = mt7621_gsw_remove,
 	.driver = {
 		.name = "mt7621-gsw",
-		.owner = THIS_MODULE,
 		.of_match_table = mediatek_gsw_match,
 	},
 };

drivers/staging/mt7621-eth/mtk_eth_soc.c

···
 	.remove = mtk_remove,
 	.driver = {
 		.name = "mtk_soc_eth",
-		.owner = THIS_MODULE,
 		.of_match_table = of_mtk_match,
 	},
 };