gpio: davinci: correct non-kerneldoc comment

Drop kerneldoc annotation from regular comment to fix:

  gpio-davinci.c:716: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-davinci.c

@@ -712,7 +712,7 @@ static struct platform_driver davinci_gpio_driver = {
 	},
 };
 
-/**
+/*
  * GPIO driver registration needs to be done before machine_init functions
  * access GPIO. Hence davinci_gpio_drv_reg() is a postcore_initcall.
  */