Kconfig: tegra: Migrate TEGRA_KEYBOARD

Migrate TEGRA_KEYBOARD from headers to Kconfig, only the seaboard uses it but we
drop CONFIG_KEYBOARD as the driver doesn't use the legacy drv_keyboard_init.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Tom Warren <twarren@nvidia.com>
Cc: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index 7afdafe..a3bdd9f 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -73,6 +73,12 @@
 	  variable 'keymap' to "de" to select German. Keyboard repeat is
 	  handled by the keyboard itself.
 
+config TEGRA_KEYBOARD
+	bool "NVIDIA Tegra internal matrix keyboard controller support"
+	help
+	  A matrix keyboard connected directly to the internal keyboard
+	  controller on Tegra SoCs.
+
 config TWL4030_INPUT
 	bool "Enable TWL4030 Input controller"
 	help