accel/ivpu: Remove disable_d0i3_msg workaround

accel/ivpu: Remove disable_d0i3_msg workaround

All published NPU firmware versions support D0i3 delayed entry
flow, making this workaround obsolete. It was originally added as
a safety measure for potential firmware bugs.

Recent firmware dropped legacy D0i3 entry support, so the workaround
can't be used anyway. Hardcode d0i3_delayed_entry boot param to 1 to
ensure older firmware works in the correct mode.

No functional changes, just dead code cleanup.

Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Link: https://patch.msgid.link/20260526125521.594479-1-andrzej.kacprowski@linux.intel.com