same7x: ETM trace support for same70_xplained

J403 (bottom-side Cortex Debug+ETM footprint, header required):
TRACECLK=PD8 peripheral D, TRACED0-3=PD4-7 peripheral C. TRACE_ETM builds
hold the KSZ8081 PHY in reset (PD4-7 are its RMII receive outputs and it
drives against the trace stream), clock the TPIU from PCK3 (MCK/2) and
mux the pins; the ozone reference starts PCK3 in the post-reset/download
hooks - TPIU programming while PCK3 is stopped is silently lost. Width-1
validated at the stock 300 MHz core; width 4 blocked on a dead D1 line
(suspect probe channel, h743eval crosscheck pending).

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