[SYCL][ESIMD] Update dgetrf_8x8 regression test. (#795)

Author: kychendev

SYCL/ESIMD/regression/dgetrf_8x8.cpp

@@ -48,7 +48,7 @@ using namespace cl::sycl;
 using namespace std;
 using namespace sycl::ext::intel::experimental::esimd;
 
-ESIMD_PRIVATE ESIMD_REGISTER(192) simd<double, 3 * 32 * 4> GRF;
+ESIMD_PRIVATE ESIMD_REGISTER(384) simd<double, 3 * 32 * 4> GRF;
 
 #define V(x, w, i) (x).template select<w, 1>(i)
 #define V1(x, i) V(x, 1, i)