snowball: Clear UART RX FIFO
Without usb-serial cable plugged at this stage, some
garbage is seen in UART RX FIFO, which blocks autoboot
progress. The fix makes sure to empty the RX FIFO,
before we wait for user input to interrupt autoboot.
Signed-off-by: NRamesh Chandrasekaran <ramesh.chandrasekaran@stericsson.com>
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