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make shi authored
- remove mx6_usb_dr_init() in board specific initialization files - Add module_init(mx6_usb_dr_init) and module_exit(mx6_usb_dr_exit) in usb_dr.c to support the usb_dr modulization - Export necessary function which is used in usb_dr.c Signed-off-by: make shi <b15407@freescale.com>
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