Add systemApis to allow data transfer over USB-C while being docked

This change adds two systemApis to UsbPortStatus viz.,
a. getUsbDataStatus: Allows caller to infer whether USB data is enabled.
b. getPowerBrickStatus: Allows caller to infer whether a power brick
                        is connected to the USB port.

The change also adds enableUsbDataWhileDocked systemApi to UsbPort to
enable Usb data momentarily.

Bug: 211677613
Bug: 213312081
Test: Manually tested on tablet
CTS-Coverage-Bug: 215019881
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Change-Id: Ib7521f0f04b7f8e3e58dc253b28072d3631f21a7