sras: reduce SZ_OVF to 8

Signed-off-by: Alban Gruin <alban.gruin@irit.fr>

src/frontend/sras.sv

@@ -17,7 +17,7 @@
 module sras #(
     parameter int unsigned DEPTH = 2,
     parameter int unsigned SpecDepth = 16,
-    parameter int unsigned SZ_OVF = 16
+    parameter int unsigned SZ_OVF = 8
 )(
     input  logic             clk_i,
     input  logic             rst_ni,