rk3399 Type-C1 USB 2.0 PHY supports USB BC1.2. This patch
adds registers configuration for Type-C1 USB BC1.2.
With this patch, and set dr_mode of Type-C1 USB to "otg" or
"peripheral" in the DTS, then the Type-C1 USB can detect USB
battery charger.
Change-Id: I2f07ae675cc6066db46e428e6e27045b911a0773
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>