imx: cortexa9: ventana, fix profiles names in profiles.json

imx: cortexa9: ventana, fix profiles names in profiles.json

These two image profiles overwrite DEVICE_NAME making the two image
profiles appear with the same name "ventana" in the "profiles.json"
mixing ramdomly the two profiles.

Use BOARD_NAME instead to keep the two profiles names unique (orginal
DEVICE_NAME) hence generating a coherent "profiles.json".

Since there are image recipes hardconding DEVICE_NAME, change them to use
BOARD_NAME if defined, in order to preserve the previous names used in
those recipes.

Fixes: cbc8bcfbaa71fe0928bf07d29ec0fe6217fd51ad ("imx6: image: use vendor_model scheme")
Reported-by: Eric Fahlgren <ericfahlgren@gmail.com>
Signed-off-by: Mario Andrés Pérez <mapb_@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/22994
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>