arm: mvebu: Add Armada 38x SERDES / PHY init code from Marvell bin_hdr

This code is ported from the Marvell bin_hdr code into mainline
SPL U-Boot. It needs to be executed very early so that the devices
connected to the serdes PHY are configured correctly.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile
index 9cdbefd..446ce04 100644
--- a/arch/arm/mach-mvebu/Makefile
+++ b/arch/arm/mach-mvebu/Makefile
@@ -20,6 +20,7 @@
 obj-$(CONFIG_SPL_BUILD) += spl.o
 obj-$(CONFIG_SPL_BUILD) += lowlevel_spl.o
 
+obj-$(CONFIG_SYS_MVEBU_DDR_A38X) += serdes/a38x/
 obj-$(CONFIG_SYS_MVEBU_DDR_AXP)	+= serdes/axp/
 
 endif