mx53loco: Fix PMIC name

commit c73368150 (pmic: Extend PMIC framework to support multiple instances
of PMIC devices) has incorrectly passed the PMIC name under the FSL PMIC case.

Fix that by passing "FSL_PMIC" as the parameter of pmic_get.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

board/freescale/mx53loco/mx53loco.c

@@ -374,7 +374,7 @@ static int power_init(void)
 		if (retval)
 			return retval;
 
-		p = pmic_get("DIALOG_PMIC");
+		p = pmic_get("FSL_PMIC");
 		if (!p)
 			return -ENODEV;