target: msm8909: use enable_gpio for 8909w BG platform

use enable_gpio to control the external buffer connected on panel
reset signal on msm8909w BG platform.

Change-Id: I8d53b7bd47e697ac49c67d23e272fd045d5013e2
diff --git a/target/msm8909/target_display.c b/target/msm8909/target_display.c
index a3d5848..c7c0ee0 100644
--- a/target/msm8909/target_display.c
+++ b/target/msm8909/target_display.c
@@ -325,6 +325,7 @@
 		};
 
 		pm8x41_gpio_config(bob_pmic_gpio, &bobgpio_param);
+		enable_gpio.pin_id = 59;
 	}
 
 	if (enable) {