USB: gadget: u_ctrl_hsic: fix a bug in control bits propagation

A work is scheduled to open the hsic transport channel upon
USB cable connect.  If the host sends SET_CONTROL_LINE_STATE
control transfer before the port is opened, the control bits
are not propagated to the mdm.

CRs-Fixed: 556039
Change-Id: Ic60830d2b04327c9ea9ded84e66b8eb7b92aee82
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>