allwinner: power: Add DLDO4 power rail

A64-OLinuXino family boards (maybe others too) uses PG for USB vbus
enable/disable. However PG is supplied by DLDO4, which is not present
in the list of known regulators. This patch adds DLD04 to it.
Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Change-Id: I31d3bb3e0004ccf5b282d08b530ee44979da0466

plat/allwinner/sun50i_a64/sunxi_power.c

@@ -191,6 +191,7 @@ static const struct axp_regulator {
 	{"dldo1",  700, 3300, 100, NO_SPLIT, 0x15, 0x12, 3},
 	{"dldo2",  700, 4200, 100,       27, 0x16, 0x12, 4},
 	{"dldo3",  700, 3300, 100, NO_SPLIT, 0x17, 0x12, 5},
+	{"dldo4",  700, 3300, 100, NO_SPLIT, 0x18, 0x12, 6},
 	{"fldo1",  700, 1450,  50, NO_SPLIT, 0x1c, 0x13, 2},
 	{}
 };