This is a port of NuttX to the STM32U5 Family

Used development board is the B-U585I-IOT02A

Most code is copied and adapted from the STM32L5 port.

The only supported STM32U5 family currently is:

-----------------------------------------------------------------
| NuttX config      | Manual | Chips
| STM32U5           | RM0456 | STM32U575xx and STM32U585xx
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TODO list
---------

Extensive testing.  Only initial sniff tests have been done.
A prober TODO list should be generated.

References
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[RM0456] STMicroelectronics, STM32U575/585 Arm(R)-based 32-bit MCUs, Rev 2
