drivers/phy: Add Marvell SerDes / PHY drivers used on Armada 3k

This version is based on the Marvell U-Boot version with this patch
applied as latest patch:

Git ID 7f408573: "fix: comphy: cp110: add comphy initialization for usb
device mode" from 2016-07-05.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Kostya Porotchkin <kostap@marvell.com>
Cc: Wilson Ding <dingwei@marvell.com>
Cc: Victor Gu <xigu@marvell.com>
Cc: Hua Jing <jinghua@marvell.com>
Cc: Terry Zhou <bjzhou@marvell.com>
Cc: Hanna Hawa <hannah@marvell.com>
Cc: Haim Boot <hayim@marvell.com>
diff --git a/drivers/Makefile b/drivers/Makefile
index ca982731..761d0b3 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -70,6 +70,7 @@
 obj-y += pcmcia/
 obj-y += dfu/
 obj-$(CONFIG_X86) += pch/
+obj-y += phy/marvell/
 obj-y += rtc/
 obj-y += sound/
 obj-y += spmi/