wandboard: Fix the DM_PMIC conversion

Commit ec837c82d709 ("imx6: wandboard: convert to DM_PMIC")
caused the following pmic_get() error:

CPU:   Freescale i.MX6QP rev1.0 at 792 MHz
Reset cause: POR
DRAM:  2 GiB
PMIC:  pmic_get() ret -19
...

and since the PMIC presence is used to determine the board D1 revision,
the following error is seen when booting a board rev D1:

WARNING: Could not determine dtb to use

and the kernel does not boot at all.

Fix the regression by passing "pfuze100@8" as the correct parameter
to the pmic_get() function in the DM case.

Fixes: ec837c82d709 ("imx6: wandboard: convert to DM_PMIC")
Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/board/wandboard/wandboard.c b/board/wandboard/wandboard.c
index 6c1e4ef..b2f961a 100644
--- a/board/wandboard/wandboard.c
+++ b/board/wandboard/wandboard.c
@@ -363,7 +363,7 @@
 
 	puts("PMIC:  ");
 
-	ret = pmic_get("pfuze100", &dev);
+	ret = pmic_get("pfuze100@8", &dev);
 	if (ret < 0) {
 		printf("pmic_get() ret %d\n", ret);
 		return 0;