media: i2c: Kconfig: Fix missing firmware upload config select

FW_LOADER config only selects the firmware loader API, but we also need
the sysfs_upload symbols for firmware_upload_unregister() and
firmware_upload_register() to function properly.

Fixes: 7a52ab41 ("media: i2c: Add driver for THine THP7312")
Cc: stable@vger.kernel.org
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Link: https://lore.kernel.org/r/20240620102544.1918105-1-kory.maincent@bootlin.com


Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>