boards/single: use FLASHFILE

[cladmi]

Contribution description

Update the boards that do not use a common board for their flasher.
Update to use FLASHFILE as file to be flashed on the board.

Testing procedure

Testing on all the board, or trust the testing without a board.

BOARDS=$(git diff --name-status HEAD~5 | cut -f 2 -d/)
echo ${BOARDS}
f4vi1 mbed_lpc1768 opencm904 teensy31 telosb z1

Testing without a board

The output of the FFLAGS is the same on master and this PR.

for board in ${BOARDS}; do echo ${board}; BOARD=${board} make --no-print-directory -C examples/hello-world/ FLASHER=true flash-only; done

for board in ${BOARDS}; do echo ${board}; BOARD=${board} make --no-print-directory -C examples/hello-world/ FLASHER=true flash-only; done
f4vi1
true write /home/harter/work/git/RIOT/examples/hello-world/bin/f4vi1/hello-world.bin 0x8000000
mbed_lpc1768
true /home/harter/work/git/RIOT/examples/hello-world/bin/mbed_lpc1768/hello-world.bin
opencm904
true /dev/ttyACM0 /home/harter/work/git/RIOT/examples/hello-world/bin/opencm904/hello-world.bin
teensy31
true --mcu=mk20dx256 /home/harter/work/git/RIOT/examples/hello-world/bin/teensy31/hello-world.hex
telosb
true --telosb -c /dev/ttyUSB0 -r -e -I -p /home/harter/work/git/RIOT/examples/hello-world/bin/telosb/hello-world.hex
z1
true --z1 -I -c /dev/ttyUSB0 -r -e -p /home/harter/work/git/RIOT/examples/hello-world/bin/z1/hello-world.hex

for board in ${BOARDS}; do echo ${board}; FLASHFILE=dogo BOARD=${board} make --no-print-directory -C examples/hello-world/ FLASHER=true flash-only; done

for board in ${BOARDS}; do echo ${board}; FLASHFILE=dogo BOARD=${board} make --no-print-directory -C examples/hello-world/ FLASHER=true flash-only; done
f4vi1
true write dogo 0x8000000
mbed_lpc1768
true dogo
opencm904
true /dev/ttyACM0 dogo
teensy31
true --mcu=mk20dx256 dogo
telosb
true --telosb -c /dev/ttyUSB0 -r -e -I -p dogo
z1
true --z1 -I -c /dev/ttyUSB0 -r -e -p dogo

Issues/PRs references

Part of #8838

[MrKevinWeiss]

Tested everything without boards and flashed the mbed_lpc1768 with FLASHFILE.
I did notice in the mbed_lpc1768 flash.sh script that a comment says 61: # make sure hexfile was written looks like hexfile has infected more than just the make system 😄

Anyways, ACK!

[cladmi]

Thank you for the review :)

comment says 61: # make sure hexfile was written looks like hexfile has infected more than just the make system

This comment was also in calliope-mini and microbit boards flasher, but it was using a binary file.
I should have updated it in 8b2ff28

[cladmi]

Fix for the comment #11740