[rv_dm, rtl] Fix debug_req_o output
[rv_dm, rtl] Fix debug_req_o output

The debug_req_o output from `dm_top` is gated further with an LC control
signal. The control signal was 1 bit wide, which only caters to 1 hart.
In order to truly support `NrHarts` number of harts, this signal (and
the gating logic) need to be expanded.

Fixes #8049.

Signed-off-by: Srikrishna Iyer <2803d640feace36379942447842f26c7747b4dc3@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan