[csrng/rtl] connect count err to fatal_err
[csrng/rtl] connect count err to fatal_err

The prim_count err was connected to the status regiser, but not the actual fatal_err signal, so connection made here.

Signed-off-by: Mark Branstad <d7ca710cc6ec5dc810c866dae5369b19445fbeef@wdc.com>

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