MAX78000: Add MAX78000FTHR Machine

MAX78000: Add MAX78000FTHR Machine

This patch adds support for the MAX78000FTHR machine.

The MAX78000FTHR contains a MAX78000 and a RISC-V core. This patch
implements only the MAX78000, which is Cortex-M4 based.
Details can be found at:
https://www.analog.com/media/en/technical-documentation/user-guides/max78000-user-guide.pdf

Signed-off-by: Jackson Donaldson <jcksn@duck.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20250704223239.248781-2-jcksn@duck.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>