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ar71xx: fix Arduino Yun enabling of level shifters outputs
As show in Arduino Yun schematic  GPIO 21 and 22 are connected to output enable pin (OE) of two NTB01xx level shifters. NTB01xx datasheets   states that OE pin are active-high therefore we should initialize GPIO 21 (DS_GPIO_OE) and GPIO 22 (DS_GPIO_OE2) accordingly to actually enable level shifters outputs.  https://www.arduino.cc/en/uploads/Main/arduino-Yun-schematic.pdf  https://www.nxp.com/docs/en/data-sheet/NTB0102.pdf  https://www.nxp.com/docs/en/data-sheet/NTB0104.pdf Signed-off-by: Edoardo Scaglia <email@example.com>
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