media: ov08x40: Properly turn sensor on/off when runtime-suspended

Commit df1ae225 ("media: ov08x40: Add OF probe support") added support
for a reset GPIO, regulators and a clk provider controlled through new
ov08x40_power_off() and ov08x40_power_on() functions.

But it missed adding a pm ops structure to call these functions on
runtime suspend/resume. Add the missing pm ops and only call
ov08x40_power_off() on remove() when not already runtime-suspended
to avoid unbalanced regulator / clock disable calls.

Fixes: df1ae225 ("media: ov08x40: Add OF probe support")
Cc: stable@vger.kernel.org
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>