board: tegra30: switch to updated pre-dm i2c write

Configure PMIC voltages for early stages using updated
early i2c write.

Tested-by: Thierry Reding <treding@nvidia.com> # Beaver T30
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom <twarren@nvidia.com>
diff --git a/board/nvidia/cardhu/Makefile b/board/nvidia/cardhu/Makefile
index 9597105..6f480cd 100644
--- a/board/nvidia/cardhu/Makefile
+++ b/board/nvidia/cardhu/Makefile
@@ -3,4 +3,6 @@
 #  (C) Copyright 2010-2012
 #  NVIDIA Corporation <www.nvidia.com>
 
-obj-y	:= cardhu.o
+obj-$(CONFIG_SPL_BUILD) += cardhu-spl.o
+
+obj-y	+= cardhu.o