Rename the IPA interface namespace to ipa::RPi for consistency with the libcamera::RPi namespace label. There is no functional change in this commit. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>