stm32h5: TRACE_ETM support and stm32h563nucleo reference

H5 hangs its debug AP if trace CoreSight is touched unclocked (recover =
power-cycle): the reference's AfterTargetConnect clocks the DBGMCU trace
domain but defers IOEN to firmware, or the mid-boot clock switch desyncs
the decoder. Stock solder bridges make the CN5 path marginal: validated
config is 100 MHz core, width 1, +5 ns (board.h selects the reduced clock
for TRACE_ETM builds); width 4 / 250 MHz retest waits on SB removal.

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