drm/i915: Limit the for_each_set_bit() to the valid range

Let static analyzers (smatch) know that we are not going to wander off
the end of the array by providing a tight upper bound:

drivers/gpu/drm/i915/intel_display.c:9532 hsw_get_transcoder_state() error: buffer overflow 'dev_priv->__info.trans_offsets' 6 <= 31

References: 0716931a82b4 ("drm/i915/icl: fix transcoder state readout")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Ville Syrjala <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Madhav Chauhan <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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