stm32h5x: fix errors due to deprecated syntax.

[csanchezdll]

trace-config event is deprecated and prints an ugly error message, recommending using pre-enable and similar events, for SWO/TPIU. Even if this was not the case, I think this event is not at the right place because access to TPIU registers in COMMAND_HANDLER(handle_arm_tpiu_swo_enable) is done before the event callback is ignored, and TPIU is not clocked without TRACE_EN so the accesses fail. I discovered this while trying to use SWO in my STH32H5x custom board. The right way is to use a pre-event when configuring swo, so either removing this callback definition altogether (as his PR does) or including swo configuration i this file (as sstm32h7x.cfg does).

mem2array is deprecated and returns no value. This means the read-modify-write logic in stm32h5x_mmw does not work. This is only used in two places where reset value is zero, so no real harm is done, but it breaks other potential uses of stm32h5x_mmw (including the ones which were on the trace-config, if it was working). This PR changes it to use read_memory, which is current.