drivers: phy: add generic PHY framework

The PHY framework provides a set of APIs to control a PHY. This API is
derived from the linux version of the generic PHY framework.
Currently the API supports init(), deinit(), power_on, power_off() and
reset(). The framework provides a way to get a reference to a phy from the
device-tree.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/phy/Makefile

@@ -0,0 +1,8 @@
+#
+# Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+# Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_$(SPL_)PHY) += phy-uclass.o