[dv,pwrmgr] Fix incoming resets

[matutem]

Description

There is a strange wiring of internal_reset_req as an input to the dut. Since this is driven by the DUT, it seems trying to drive it via pwrmgr_if ends up being a NO-OP, and pwrmgr_smoke gets hung waiting for a reset. I vaguely recall this strange configuration was meant as a temporary workaround, but perhaps its time is up?