[SYCL][JM tests] remove unused variables (#13169)

Author: dkhaldi

sycl/test-e2e/Matrix/joint_matrix_annotated_ptr_impl.hpp

@@ -14,15 +14,6 @@ void matrix_multiply(T1 *C, T2 *A, T2 *B, queue &q) {
          [=](nd_item<2> spmd_item) [[intel::reqd_sub_group_size(SG_SZ)]]
 
          {
-           auto pA =
-               address_space_cast<sycl::access::address_space::global_space,
-                                  sycl::access::decorated::no>(A);
-           auto pB =
-               address_space_cast<sycl::access::address_space::global_space,
-                                  sycl::access::decorated::no>(B);
-           auto pC =
-               address_space_cast<sycl::access::address_space::global_space,
-                                  sycl::access::decorated::no>(C);
            const auto global_idx = spmd_item.get_global_id(0);
            const auto global_idy = spmd_item.get_global_id(1);
            const auto sg_startx = global_idx - spmd_item.get_local_id(0);