All the boards supported by the gpio-ts4900 driver are i.MX6 boards,
so only offer the driver for building on this platform, unless
build-testing.
Signed-off-by: NJean Delvare <jdelvare@suse.de>
Cc: Lucile Quirion <lucile.quirion@savoirfairelinux.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>