media: venus: Fix firmware path for sm8250

The firmware path for the sm8250 resources is incorrect. This fixes the
path to address the firmware correctly.

Signed-off-by: Patrick Whewell <patrick.whewell@sightlineapplications.com>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>