remove flash-kevin.sh script now that we have servoflash.py

The servoflash.py script has been tested with a "hana" Chromebook
which was previously flashed using flash-kevin.sh.  So flash-kevin.sh
can now be dropped.
Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>

flash-kevin.sh

-#!/bin/bash
-
-set -e
-
-export PATH=$PWD/bin:$PATH
-export LD_LIBRARY_PATH=$PWD/lib:$LD_LIBRARY_PATH
-
-device="$1"
-serial="$2"
-fw="$3"
-backup="${4:-$device-backup.bin}"
-
-[ -n "$device" ] || {
-    echo "Missing device name"
-    exit 1
-}
-
-[ -n "$fw" ] || {
-    echo "Missing firmware file"
-    exit 1
-}
-
-[ -f "$fw" ] || {
-    echo "Firmware file not found: $fw"
-    exit 1
-}
-
-cmd()
-{
-    local args="$@"
-    echo "args: [$args]"
-    dut-control --rcfile=/etc/google-servo.conf -n $device $args
-}
-
-md5sum "$fw"
-
-echo "* reset"
-cmd cold_reset:off
-sleep 1
-cmd cold_reset:on
-sleep 1
-
-echo "* vref on"
-cmd spi2_vref:pp1800 spi2_buf_en:on
-sleep 1
-
-
-echo "* backup $backup"
-flashrom --programmer raiden_debug_spi:serial=$serial -r "$backup"
-
-echo "* fw_wp"
-cmd fw_wp_en:on
-cmd fw_wp:off
-cmd fw_up:on
-cmd fw_wp_en
-cmd fw_wp
-cmd fw_up
-sleep 1
-
-echo "* erase"
-flashrom --programmer raiden_debug_spi:serial=$serial -E
-
-echo "* flash [$fw]"
-flashrom --programmer raiden_debug_spi:serial=$serial -w "$fw"
-
-echo "* vref off"
-cmd spi2_vref:off spi2_buf_en:off
-sleep 1
-
-echo "* reboot"
-cmd cpu_uart_en:on
-cmd dev_mode:on
-sleep 1
-cmd cpu_uart_en
-cmd dev_mode
-cmd cold_reset:off
-cmd dev_mode:on
-sleep 1
-cmd dev_mode
-
-exit 0