usb: dwc3: use dev_get_platdata()
usb: dwc3: use dev_get_platdata()

Use the wrapper function for retrieving the
platform_data instead of accessing dev->platform_data
directly.

While at that also make change 'node' initialization
to use the dev pointer.

Inspired-by: Jingoo Han  <fc379137a64feb86ce38ec5811a14280acc1ccfc@samsung.com>
Signed-off-by: Felipe Balbi <94dddeeef08b001e003cce128ddc162a4e2c6cd2@ti.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs