Updated to avoid I2C collision with OLED i2c

change into IRQ, if we detect I2C detect issued from Pi we validate I2C
test and start refresh OLED
Set SPI speed to 1MHZ / removed i2C Ping

Set SPI speed to 1MHZ
removed i2c ping test
bug fix on SPI set bus speed

launching tool trying to set spi speed with --maxspeed 1000 was not
working du to a bug on parsing option