tegra: video: Move LCD driver to use the DM PWM driver

Use the driver-model PWM driver in preference to the old code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index e5880ac..6f0d61e 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -20,6 +20,7 @@
 
 config PWM_TEGRA
 	bool "Enable support for the Tegra PWM"
+	depends on DM_PWM
 	help
 	  This PWM is found on Tegra 20 and other Nvidia SoCs. It supports
 	  four channels with a programmable period and duty cycle. Only a