Recovery: uefi: Input char 'f' to force fastboot mode
Recovery: uefi: Input char 'f' to force fastboot mode

UEFI booting images might not automatically run into fastboot mode, thus
the sequential steps fail to flash images.  This patch adds an extra
option to set the console device node for Hikey960, and the script sends
char 'f' to the console device so can force UEFI to run into fastboot
mode.

The suggested command is as below:

  sudo ./recovery-flash-uefi-prebuilt.sh -d \
	  -t /dev/ttyUSB0 -c /dev/ttyUSB1
	          ^^^             ^^^
	          USB/OTG port    USB/UART port

Signed-off-by: Leo Yan <a38ad1fbd0b3373e0c012f4d28e16dbce652d487@linaro.org>

96boards-hikey/tools-images-hikey960,96boards-hikey/tools-images-hikey960