arm64: dts: apple: Add A10 devices

Add DTS files for the A10 SoC and the following devices based on it:

- iPhone 7
- iPhone 7 Plus
- iPod touch 7
- iPad 6
- iPad 7

Signed-off-by: Konrad Dybcio <konradybcio@kernel.org>
[Nick: SMP, m1n1 and AOP pinctrl support]
Co-developed-by: Nick Chan <towinchenmi@gmail.com>
Signed-off-by: Nick Chan <towinchenmi@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>