gpio: ucb1400: Can be built as a module
gpio: ucb1400: Can be built as a module

With the recent code cleanup from Marek Vasut, driver gpio-ucb1400 can
be built as a module, so change symbol GPIO_UCB1400 from bool to
tristate.

Signed-off-by: Jean Delvare <efca98801f3398ebd7eeff805a2c18e6c49e84d4@suse.de>
Reviewed-by: Marek Vasut <f40600653b33f5282fa4c5daf377dfc444fb4625@denx.de>
Cc: Linus Walleij <9cd9d802d23c0ed5e224beabf4ae4a5c478746ef@linaro.org>
Signed-off-by: Linus Walleij <9cd9d802d23c0ed5e224beabf4ae4a5c478746ef@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs