ST STM32L5

This is a port of NuttX to the STM32L5 Family

Used development boards are the Nucleo L552ZE-Q, and STM32L562E-DK.

Most code is copied and adapted from the STM32L4 port.

The only supported STM32L5 family currently is:

NuttX config	Manual	Chips
STM32L5	RM0438	STM32L552xx and STM32L562xx

TODO list

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