if_dwc add reset-gpio

[manu_bidouilliste.com]

Summary

The snps have some optional property for reseting the phy via gpios.
This patch implement the reset.

Test Plan

Apply patch and test on systems with dwc

[jmcneill]

sys/dev/dwc/if_dwc.c

1083

Indent 4 spaces instead of a tab for multi-line if condition.

1087

4 spaces here too

1100

Instead of active_low = 0/1 it would simplify the GPIO_PIN_SET calls later if you had int value and set it to either GPIO_PIN_LOW/GPIO_PIN_HIGH

1103

4 spaces here too

[manu_bidouilliste.com]

Simplify the active_low logic.

[manu_bidouilliste.com]

Respect optional pin polarity.

[br]

sys/dev/dwc/if_dwc.c

1041

line is too long

[manu_bidouilliste.com]

Fix style(9)