usb: musb: jz4740: Add local dev variable to clean up probe

Clean up the probe function by using a local 'struct device *dev'
variable, instead of referencing &pdev->dev everytime.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200115132547.364-13-b-liu@ti.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>