dt-bindings: arm: bcm: unify version notation of Northstar devices

Always use a minus/hyphen char to separate model from version. This
unifies binding's "compatible" strings.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230520112601.11821-1-zajec5@gmail.com


Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>