arm64: dts: apple: Add minimal t8132 (M4) device trees

Added device trees for the following devices:
- apple,j604 - MacBook Pro (14-inch, M4, 2024)
- apple,j623 - iMac (24-inch, 2x USB-C, M4, 2024)
- apple,j624 - iMac (24-inch, 4x USB-C, M4, 2024)
- apple,j713 - MacBook Air (13-inch, M4, 2025)
- apple,j715 - MacBook Air (15-inch, M4, 2025)
- apple,j773g - Mac mini (M4, 2024)

The device trees have a minimal set of devices limited to CPU cores,
interrupt controller, power states, watchdog, serial, pin controller,
i2c and framebuffer.
The device trees for the notebooks add a PWM controller for the keyboard
LED illumination.

Using the macOS 26.6 iBoot/firmware, the Mac mini reliably boots on a
single core using the stock kernel.
Booting with smp requires avoiding the wfi and wfit instructions
in the idle loop and `delay()` respectively, since those instructions
cause a loss of architectural state on the secondary cores, and even
then boot is unreliable.

Signed-off-by: Yureka Lilian <yureka@cyberchaos.dev>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260811-apple-m4-initial-devicetrees-v3-9-6bf32d45ad0b@cyberchaos.dev
Signed-off-by: Sven Peter <sven@kernel.org>

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