r8152: add pre_reset and post_reset
Add rtl8152_pre_reset() and rtl8152_post_reset() which are used when calling usb_reset_device(). The two functions could reduce the time of reset when calling usb_reset_device() after probe(). Signed-off-by: NHayes Wang <hayeswang@realtek.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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