target: msm8974: Modify ctrl sequence of target_backlight_ctrl

Program WLED modulator enable registers using
pm8x41_wled_led_mod_enable API to change brightness
in bootloader.

CRs-Fixed: 584769
Change-Id: I19edc2ebaf1569c6c55aea7c3c8f4f26e7e70796
diff --git a/target/msm8974/target_display.c b/target/msm8974/target_display.c
index 5f79630..ddee155 100644
--- a/target/msm8974/target_display.c
+++ b/target/msm8974/target_display.c
@@ -110,6 +110,7 @@
 		pm8x41_wled_config(&wled_ctrl);
 		pm8x41_wled_sink_control(enable);
 		pm8x41_wled_iled_sync_control(enable);
+		pm8x41_wled_led_mod_enable(enable);
 	}
 	pm8x41_wled_enable(enable);