FIXUP: UPSTREAM: phy: Add USB Type-C PHY driver for rk3399

FIXUP: UPSTREAM: phy: Add USB Type-C PHY driver for rk3399

This patch aims to make code sync with upstream[1]. And it
can fix the following issues:

1. Introduce the EXTCON_PROP_USB_SS property to support both
   DP 2*lanes + USB3.0 and DP 4*lanes + USB2.0 mode;
2. Fix the bug that the USB3 phy power on should not return
   err when no USB attached, since the USB3 controller will
   power_on phy at probe/resume, even though there is no USB3
   super speed device attached. At this case, return 0 and do
   nothing is better.
3. Create 2 PHY devices separately for USB3 and DisplyPort,
   and registers them under the child node.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
commit <e96be45cb84e29e58f35ed460a859b61e8bf28c5>

Change-Id: Ib388a072f11d80624ec6e16291eab497a3dcb0e1
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>