dcd/ch58x: report bus resume instead of a second suspend

The USBFS SUSPEND interrupt fires on both the suspend and the resume edge, but the
handler unconditionally posted DCD_EVENT_SUSPEND. On CH58x tud_resume_cb() therefore
never ran, and a device that lowered clocks/power in tud_suspend_cb() was never told
to restore them. Read MIS_ST's suspend bit (1 while suspended, 0 once resumed) to emit
DCD_EVENT_RESUME on the wake edge -- what the removed dcd_ch58x_usbfs.c did. Scoped to
CH58x via #if; the CH32 parts keep their existing behavior.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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