Add support for Nucleo U545RE-Q

[dansiviter]

Is your feature request/improvement related to a problem? Please describe.

Although potentially indirectly supported, direct support for Nucleo U545RE-Q isn't currently listed.

Describe the solution you'd like

Direct support for Nucleo U545RE-Q.

Describe alternatives you've considered

Generic STM32U5

Additional context

N/A

[fpistm]

Added to #722