board: ge: bx50v3: Use pwm for display backlight

Setup the LCD backlight brightness control pin to use PWM

Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/include/configs/ge_bx50v3.h b/include/configs/ge_bx50v3.h
index 6fa4a9a..e37cd33 100644
--- a/include/configs/ge_bx50v3.h
+++ b/include/configs/ge_bx50v3.h
@@ -327,6 +327,9 @@
 #define CONFIG_IMX_HDMI
 #define CONFIG_IMX_VIDEO_SKIP
 
+#define CONFIG_PWM_IMX
+#define CONFIG_IMX6_PWM_PER_CLK	66000000
+
 #undef CONFIG_CMD_PCI
 #ifdef CONFIG_CMD_PCI
 #define CONFIG_PCI