drm/mst: Fix up u64 division

Change rem_nsec to u32 since that's what do_div returns, this avoids the
u64 divide in the drm_print args.

Changes in v2:
- Instead of doing do_div in drm_print, make rem_nsec u32 (Ville)

Link to v1: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Fixes: 12a280c72868 ("drm/dp_mst: Add topology ref history tracking for debugging")
Cc: Juston Li <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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