arm64: dts: ti: Add support for Kontron SMARC-sAM67

arm64: dts: ti: Add support for Kontron SMARC-sAM67

Add device tree support for the Kontron SMARC-sAM67 module, which is
based on a TI AM67A SoC.

The module features:
 * Quad-core AM67A94 at 1.4GHz with 8 GiB RAM
 * 64 GiB eMMC, 4 MiB SPI flash for failsafe booting
 * Dedicated RTC
 * Multiple interfaces: 4x UART, 2x USB 2.0/USB 3.2, 2x GBE, QSPI,
        7x I2C,
 * Display support: 2x LVDS, 1x DSI (*), 1x DP (*)
 * Camera support: 4x CSI (*)
 * Onboard microcontroller for boot control, failsafe booting and
   external watchdog

(*) not yet supported by the kernel

There is a base device tree and overlays which will add optional
features. At the moment there is one full featured variant of that
board whose device tree is generated during build by merging all the
device tree overlays.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>
Link: https://patch.msgid.link/20251017135116.548236-3-mwalle@kernel.org
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>