sunxi: power: axp818: Add support for switch SW

The AXP818 has a switchable output, SW. This is commonly used for
controlling power to the LCD backlight.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index 3cf3614..6a0a8db 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -523,6 +523,7 @@
 	power_failed |= axp_set_fldo(1, CONFIG_AXP_FLDO1_VOLT);
 	power_failed |= axp_set_fldo(2, CONFIG_AXP_FLDO2_VOLT);
 	power_failed |= axp_set_fldo(3, CONFIG_AXP_FLDO3_VOLT);
+	power_failed |= axp_set_sw(IS_ENABLED(CONFIG_AXP_SW_ON));
 #endif
 #endif
 	printf("DRAM:");