mfd: tps65090: Add compatible string for charger subnode

This patch adds the of_compatible value for the tps65090 charger
subnode used when loading the driver to find its properties
and of_node.

Signed-off-by: Rhyland Klein <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/mfd/tps65090.c

···
 		.name = "tps65090-charger",
 		.num_resources = ARRAY_SIZE(charger_resources),
 		.resources = &charger_resources[0],
+		.of_compatible = "ti,tps65090-charger",
 	},
 };