media: venus: hfi_venus: Sanitize venus_cpu_idle_and_pc_ready() per-VPU-version

Replace the general IS_V6 checks with more specific VPU version checks.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>