Set initial state of all k6n10f DSP registers to zero.

Signed-off-by: Maciej Kurc <mkurc@antmicro.com>

ql-qlf-plugin/qlf_k6n10f/cells_sim.v

diff --git a/ql-qlf-plugin/qlf_k6n10f/cells_sim.v b/ql-qlf-plugin/qlf_k6n10f/cells_sim.v
index 6dac58b..f2e7b05 100644
--- a/ql-qlf-plugin/qlf_k6n10f/cells_sim.v
+++ b/ql-qlf-plugin/qlf_k6n10f/cells_sim.v
@@ -1472,6 +1472,22 @@
     reg			r_rnd;
     reg [NBITS_ACC-1:0] acc;
 
+    initial begin
+        r_a          <= 'h0;
+        r_b          <= 'h0;
+
+	    r_acc_fir	 <= 0;
+        r_unsigned_a <= 0;
+        r_unsigned_b <= 0;
+        r_feedback   <= 0;
+        r_shift_d1   <= 0;
+        r_shift_d2   <= 0;
+	    r_subtract   <= 0;
+        r_load_acc   <= 0;
+        r_sat	     <= 0;
+        r_rnd	     <= 0;
+    end
+
     always @(posedge clock_i or negedge reset_n_i) begin
         if (~reset_n_i) begin
 
@@ -1566,7 +1582,9 @@
 
     wire [NBITS_ACC-1:0] add_o = add_a + add_b;
 
-    // Accumulator    
+    // Accumulator
+    initial acc <= 0;
+
     always @(posedge clock_i or negedge reset_n_i)
         if (~reset_n_i) acc <= 'h0;
         else begin
@@ -1603,6 +1621,8 @@
     assign z0 = mult_xtnd[NBITS_Z-1:0];
     assign z2 = acc_sat[NBITS_Z-1:0];
 
+    initial z1 <= 0;
+
     always @(posedge clock_i or negedge reset_n_i)
         if (!reset_n_i)
             z1 <= 0;
@@ -1621,6 +1641,8 @@
 					       z1;	// if output_select_i == 3'h7
 
     // B input delayed passthrough
+    initial dly_b_o <= 0;
+
     always @(posedge clock_i or negedge reset_n_i)
         if (!reset_n_i)
             dly_b_o <= 0;

ql-qlf-plugin/tests/qlf_k6n10f/sim_dsp_mult_r/sim_dsp_mult_r.v

diff --git a/ql-qlf-plugin/tests/qlf_k6n10f/sim_dsp_mult_r/sim_dsp_mult_r.v b/ql-qlf-plugin/tests/qlf_k6n10f/sim_dsp_mult_r/sim_dsp_mult_r.v
index 6187e1a..fbc1ba9 100644
--- a/ql-qlf-plugin/tests/qlf_k6n10f/sim_dsp_mult_r/sim_dsp_mult_r.v
+++ b/ql-qlf-plugin/tests/qlf_k6n10f/sim_dsp_mult_r/sim_dsp_mult_r.v
@@ -58,6 +58,7 @@
 
     // Error detection
     reg [37:0] r_C;
+    initial r_C <= 0;
     always @(posedge clk)
         r_C <= C;