Fix TMC5160 and TMC2160 PWMCONF init

Marlin/src/module/stepper_indirection.cpp

 
     st.en_pwm_mode(stealth);
 
-    PWMCONF_t pwmconf{0};
-    pwmconf.pwm_freq = 0b01; // f_pwm = 2/683 f_clk
+    TMC2160_n::PWMCONF_t pwmconf{0};
+    pwmconf.pwm_lim = 12;
+    pwmconf.pwm_reg = 8;
+    pwmconf.pwm_autograd = true;
     pwmconf.pwm_autoscale = true;
-    pwmconf.pwm_grad = 5;
-    pwmconf.pwm_ampl = 180;
+    pwmconf.pwm_freq = 0b01;
+    pwmconf.pwm_grad = 14;
+    pwmconf.pwm_ofs = 36;
     st.PWMCONF(pwmconf.sr);
 
     #if ENABLED(HYBRID_THRESHOLD)
 
     st.en_pwm_mode(stealth);
 
-    PWMCONF_t pwmconf{0};
-    pwmconf.pwm_freq = 0b01; // f_pwm = 2/683 f_clk
+    TMC2160_n::PWMCONF_t pwmconf{0};
+    pwmconf.pwm_lim = 12;
+    pwmconf.pwm_reg = 8;
+    pwmconf.pwm_autograd = true;
     pwmconf.pwm_autoscale = true;
-    pwmconf.pwm_grad = 5;
-    pwmconf.pwm_ampl = 180;
+    pwmconf.pwm_freq = 0b01;
+    pwmconf.pwm_grad = 14;
+    pwmconf.pwm_ofs = 36;
     st.PWMCONF(pwmconf.sr);
 
     #if ENABLED(HYBRID_THRESHOLD)