imx: ventana: detect pmic using i2c probe instead of board model

Avoid requiring board-model and probe pmic by its i2c address.
This is in preparation for being able to call pmic_setup() from SPL
and not need board type.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index 8c6f469..22f3b38 100644
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -468,7 +468,7 @@
 /* setup board specific PMIC */
 int power_init_board(void)
 {
-	setup_pmic(board_type);
+	setup_pmic();
 	return 0;
 }