* the nsim host timer does not work as expected,
disable it, use cycle count to simulate timer tick
* optmize the freq definition of nsim_em
Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
two configs are contained in this board
* nsim_em: em with arc MPUv2
* nsim_sem: em with arc SecureShield and MPUv3
Signed-off-by: Wayne Ren <wei.ren@synopsys.com>