dm: tegra: Convert keyboard driver to driver model

Adjust the tegra keyboard driver to support driver model, using the new
uclass. Make this the default for all Tegra boards so that those that use
a keyboard will build correctly with this driver.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index a5b7e0d..de2454e 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -12,6 +12,7 @@
 	select DM_I2C
 	select DM_SPI
 	select DM_GPIO
+	select DM_KEYBOARD
 
 choice
 	prompt "Tegra SoC select"