Minor syntax fix VM2 PREFETCH

[xolod79]

I think we need to change blocking to non blocking statements.

-       bir_fix = (breg[14:12] != 3'o0)    // two ops instructions
+       bir_fix <= (breg[14:12] != 3'o0)    // two ops instructions

In these places:

cpu11/vm2/hdl/org/rtl/vm2_qbus.v

Line 1031 in abe8b68

pc2_res = (breg[14:12] != 3'o0) // two ops instructions

cpu11/vm2/hdl/syn/rtl/vm2_qbus.v

Line 1025 in abe8b68

bir_fix = (breg[14:12] != 3'o0) // two ops instructions

cpu11/vm2/hdl/wbc/rtl/vm2_wb.v

Line 730 in abe8b68

bir_fix = (breg[14:12] != 3'o0) // two ops instructions