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/configs/seaboard_defconfig b/configs/seaboard_defconfig
index 304a292..aa46f06 100644
--- a/configs/seaboard_defconfig
+++ b/configs/seaboard_defconfig
@@ -23,6 +23,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="tegra20-seaboard"
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_I2C_TEGRA=y
+CONFIG_TEGRA_KEYBOARD=y
 CONFIG_SPL_DM=y
 CONFIG_DM_PMIC=y
 CONFIG_DM_REGULATOR=y