imx6: aristainetos: convert to DM_PWM/DM_BACKLIGHT

use DM_PWM and DM_BLACKLIGHT support and remove
board code.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/aristainetos2_defconfig b/configs/aristainetos2_defconfig
index fd58aad..b981b20 100644
--- a/configs/aristainetos2_defconfig
+++ b/configs/aristainetos2_defconfig
@@ -86,6 +86,7 @@
 CONFIG_DM_PMIC=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_DM_PWM=y
 CONFIG_PWM_IMX=y
 CONFIG_DM_RTC=y
 CONFIG_RTC_DS1307=y