ZGEMV var 2 bug fix

- Fixed segmentation fault that was seen on non zen and non avx2
  machines.
- cntx object was not passed to the invoked kernel causing a seg
  fault.

AMD-Internal: [CPUPL-3167]
Change-Id: I2640d3f905e78398935cf6ed667b04a6418baa5d

frame/2/gemv/bli_gemv_unf_var2_amd.c

@@ -718,7 +718,7 @@ void bli_zgemv_unf_var2
         beta,
         y, incy,
         y_buf, buf_incy,
-        NULL
+        cntx
       );
 
       /*
@@ -737,7 +737,7 @@ void bli_zgemv_unf_var2
       n_elem,
       beta,
       y_buf, buf_incy,
-      NULL
+      cntx
     );
   }
 
@@ -783,7 +783,7 @@ void bli_zgemv_unf_var2
       n_elem,
       y_buf, buf_incy,
       y, incy,
-      NULL
+      cntx
     );
 
 #ifdef BLIS_ENABLE_MEM_TRACING