imxrt: TRACE_ETM for RT1011 and RT1176, validate both boards

metro_m7_1011 (custom ETM-header rework): 500 MHz core, 66 MHz TRACECLK
width 4, +50 ps; trace_etm_init ungates the 132 MHz trace root that
BOARD_BootClockRUN leaves gated. mimxrt1170_evkb: 996 MHz CM7 at width 1,
CSTRACE pinned to 50 MHz (stock 132 corrupts - the Ethernet PHY loads the
CLK net) and the CM7 platform trace-funnel port enabled in firmware:
J-Link does not program that funnel and everything reads register-perfect
yet silent without it. FlexSPI boot needs the committed SP/PC hooks; D1-D3
stay dead pending the R1882-R1884 continuity check (width-4 TODO).

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