Remove duplicate serial console section (#485)

Author: isius

board/raspberrypi/post-image.sh

@@ -19,17 +19,6 @@ __EOF__
    fi
 fi
 
-if [ ! "x${BLUETOOTH}" = "x" ]; then
-   if ! grep -qE '^enable_uart=1' "${BINARIES_DIR}/rpi-firmware/config.txt"; then
-      echo "Adding serial console to /dev/ttyS0 to config.txt."
-      sed -i 's/ttyAMA0/ttyS0/g' "${BINARIES_DIR}/rpi-firmware/cmdline.txt"
-      cat << __EOF__ >> "${BINARIES_DIR}/rpi-firmware/config.txt"
-# Fixes rpi3 ttyS0 serial console
-enable_uart=1
-__EOF__
-   fi
-fi
-
 for arg in "$@"
 do
 	case "${arg}" in