[SYCL][Joint Matrix][E2E] Remove xfail from Joint Matrix runtime dimension tests (#15784)
Description:
The failure of the tests joint_matrix_bf16_fill_k_cache_arg_dim.cpp and
joint_matrix_bf16_fill_k_cache_runtime_dim.cpp has been addressed in
commit
https://github.com/intel/intel-graphics-compiler/commit/92236dc2d0c769b97ba3700b361652013b2cf1c8.
The commit solves the issue by changing the Acc 32x64 and Acc 32x32
matrix types from using the array type [2 x <float x 64>] to a structure
type { <float x 64>, <float x 64> }