Revert "gpio: winbond: fix ISA_BUS_API dependency"

This reverts commit 92a8046c.

Now that the patch series changing ISA_BUS_API dependency to selection
was merged this reversion will do the same for gpio-winbond driver to
make it consistent with other ISA bus gpio drivers.
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -722,7 +722,7 @@ config GPIO_TS5500
 
 config GPIO_WINBOND
 	tristate "Winbond Super I/O GPIO support"
-	depends on ISA_BUS_API
+	select ISA_BUS_API
 	help
 	  This option enables support for GPIOs found on Winbond Super I/O
 	  chips.