Update rpihw.c (#134)
Update rpihw.c (#134)

Added details for new Pi 2 model with BCM2837 SOC.
jgarff/rpi_ws281x,Margravegit/rainbowraceway,tykune21/rpi_ws281x,jgarff/rpi_ws281x,Margravegit/rainbowraceway,jgarff/rpi_ws281x,tykune21/rpi_ws281x,tykune21/rpi_ws281x,Margravegit/rainbowraceway