configs: imx8mm_evk: add pwm backlight support

Enable support for backlight/pwm-imx driver

Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
diff --git a/configs/imx8mm_evk_defconfig b/configs/imx8mm_evk_defconfig
index 8126878..2853b57 100644
--- a/configs/imx8mm_evk_defconfig
+++ b/configs/imx8mm_evk_defconfig
@@ -85,3 +85,7 @@
 CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_DM_THERMAL=y
 CONFIG_IMX_WATCHDOG=y
+CONFIG_BACKLIGHT=y
+CONFIG_BACKLIGHT_PWM=y
+CONFIG_DM_PWM=y
+CONFIG_PWM_IMX=y
\ No newline at end of file