app: aboot: set current LUN before reading partition.

Set LUN before reading partition.

Change-Id: I241b3abf670138800add90959c639aab2a0aba05
diff --git a/app/tests/kauth_test.c b/app/tests/kauth_test.c
index e92922e..a4c8d01 100644
--- a/app/tests/kauth_test.c
+++ b/app/tests/kauth_test.c
@@ -73,6 +73,7 @@
 #if !VERIFIED_BOOT
 	index = partition_get_index("system");
 	ptn = partition_get_offset(index);
+	mmc_set_lun(partition_get_lun(index));
 
 	if(!ptn)
 	{