gpio: bt8xx: allow to build the module with COMPILE_TEST=y

Link: https://lore.kernel.org/r/20250310-gpiochip-set-conversion-v1-6-03798bb833eb@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/Kconfig

@@ -1671,7 +1671,7 @@ config GPIO_AMD8111
 
 config GPIO_BT8XX
 	tristate "BT8XX GPIO abuser"
-	depends on VIDEO_BT848=n
+	depends on VIDEO_BT848=n || COMPILE_TEST
 	help
 	  The BT8xx frame grabber chip has 24 GPIO pins that can be abused
 	  as a cheap PCI GPIO card.