media: v4l: sr030pc30: Remove redundant setting of sub-device name

The sub-device name is set right after in v4l2_i2c_subdev_init(). Remove
the redundant strcpy() call.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>