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This CL adds a new class to monitor and change dual role usb ports from userspace. The usb phy drivers can register to the dual_role_usb class and expose the capabilities of the ports. The phy drivers can decide on whether a specific attribute can be changed from userspace by choosing to implement the appropriate callback. Signed-off-by: Badhri Jagan Sridharan <badhri@google.com> Bug: 21615151 Change-Id: I121b4a94437972b5abe8f781e3007efa8531978 (cherry picked from commit f3061b9d608ce2314f24088281131ebadafa3985)