gpio: loongson1: allow building the module with COMPILE_TEST enabled

Increase build coverage by allowing the module to be built with
COMPILE_TEST=y.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250910-gpio-mmio-gpio-conv-part4-v2-1-f3d1a4c57124@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/Kconfig

@@ -885,7 +885,7 @@ config GPIO_ZYNQMP_MODEPIN
 
 config GPIO_LOONGSON1
 	tristate "Loongson1 GPIO support"
-	depends on MACH_LOONGSON32
+	depends on MACH_LOONGSON32 || COMPILE_TEST
 	select GPIO_GENERIC
 	help
 	  Say Y or M here to support GPIO on Loongson1 SoCs.