boards: arm: Clarify J-Link OpenSDA firmware usage for frdm_k64f
boards: arm: Clarify J-Link OpenSDA firmware usage for frdm_k64f

Updates the frdm_k64f board documentation to clarify that the J-Link
OpenSDA firmware version depends on the DAPLink bootloader version.

Signed-off-by: Derek Snell <9880443217b501015ad6795c2d4520252a934dea@nxp.com>
Signed-off-by: Maureen Helm <87a696db5547fa477bda9f9e0f00013c839c14d3@nxp.com>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr