media: i2c: Re-order runtime pm initialisation

The kerneldoc for pm_runtime_set_suspended() says:

"It is not valid to call this function for devices with runtime PM
enabled"

To satisfy that requirement, re-order the calls so that
pm_runtime_enable() is the last one.

Fixes: 11c0d8fd ("media: i2c: Add support for the OV8865 image sensor")
Signed-off-by: Daniel Scally <djrscally@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>