[dv,pwm] Remove constraint on htbt_en & !blink_en

Modify the DV so that it does not avoid this configuration;
the specification stipulates clearly what should happen
and the contention is therefore that the DV should exercise
that combination too.

Signed-off-by: Adrian Lees <[email protected]>

hw/ip/pwm/dv/env/seq_lib/pwm_rand_output_vseq.sv

@@ -16,20 +16,13 @@ class pwm_rand_output_vseq extends pwm_base_vseq;
   // If true, this stops the clock in "low power" mode
   rand bit low_power;
 
-  // Make sure to enable blink if the heartbeat is enabled
-  extern constraint htbt_implies_blink_c;
-
   // Model low power mode 10% of the time.
   extern constraint low_power_c;
 
   extern function new (string name="");
   extern virtual task body();
 endclass
 
-constraint pwm_rand_output_vseq::htbt_implies_blink_c {
-  rand_reg_param.HtbtEn == 1'b1 -> rand_reg_param.BlinkEn == 1'b1;
-}
-
 constraint pwm_rand_output_vseq::low_power_c {
   low_power dist {1'b1:/1, 1'b0:/9};
 }