scripts: Add ezFlashCLI runner

This adds support for ezFlashCLI tool to allow flashing DA1469x MCU
family from Renesas.

The tool is available at https://github.com/ezflash/ezFlashCLI

 or can
be installed via pip.

Signed-off-by: Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
Signed-off-by: Ben Lauret <ben.lauret.wm@renesas.com>