dt-bindings: arm: apple: Add A9 devices

dt-bindings: arm: apple: Add A9 devices

Adds the following apple,s8000 and apple,s8003 based platforms:

- iPhone 6s
- iPhone 6s Plus
- iPhone SE (2016)
- iPad 5

apple,s8000 is the Samsung A9, while apple,s8003 is the TSMC A9.

Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Nick Chan <towinchenmi@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>