media: atomisp: Prefix firmware paths with "intel/ipu/"

The atomisp firmwares have been added to upstream linux-firmware
under intel/ipu/ add this prefix to the firmware name passed
to request_firmware().

Fall back to the old location if this fails to avoid breaking existing
setups.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20240603132057.255917-3-hdegoede@redhat.com


Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>