scripts/librem5-devkit-flash-image: add an arg for the board type

Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>

scripts/librem5-devkit-flash-image

@@ -260,6 +260,8 @@ def main():
                         "devkit image download. 0-unlimited")
     parser.add_argument('--variant', choices=['legacy', 'current', 'next'], default=BOARD_VARIANT,
                         help='Variant of the board to download ( legacy, current, next )')
+    parser.add_argument('--board', choices=['devkit', 'librem5'], default=BOARD_TYPE,
+                        help='Type of the board to download ( devkit, librem5 )')
 
     group = parser.add_argument_group(title='Testing and debugging options')
     group.add_argument('--debug', action="store_true", default=False,