gpio: tegra186: Allow building on Tegra194-only configurations

The driver is compatible with both Tegra186 and Tegra194, but currently
it cannot be selected if only Tegra194 support is enabled. Allow builds
with only Tegra194 support enabled to select this driver.

While at it, select this driver by default on Tegra194 builds because it
is an essential part of the system.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20191213130034.219227-1-thierry.reding@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -553,8 +553,8 @@ config GPIO_TEGRA
 
 config GPIO_TEGRA186
 	tristate "NVIDIA Tegra186 GPIO support"
-	default ARCH_TEGRA_186_SOC
-	depends on ARCH_TEGRA_186_SOC || COMPILE_TEST
+	default ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC
+	depends on ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC || COMPILE_TEST
 	depends on OF_GPIO
 	select GPIOLIB_IRQCHIP
 	select IRQ_DOMAIN_HIERARCHY