[SYCL] Fix the backend name in the warning message (#7157)

Author: bader

sycl/include/sycl/backend_types.hpp

@@ -28,7 +28,7 @@ enum class backend : char {
   cuda __SYCL2020_DEPRECATED("use 'ext_oneapi_cuda' instead") = ext_oneapi_cuda,
   all = 4,
   ext_intel_esimd_emulator = 5,
-  esimd_cpu __SYCL2020_DEPRECATED("use 'ext_oneapi_esimd_emulator' instead") =
+  esimd_cpu __SYCL2020_DEPRECATED("use 'ext_intel_esimd_emulator' instead") =
       ext_intel_esimd_emulator,
   ext_oneapi_hip = 6,
   hip __SYCL2020_DEPRECATED("use 'ext_oneapi_hip' instead") = ext_oneapi_hip,

sycl/test/warnings/sycl_2020_deprecations.cpp

@@ -167,7 +167,7 @@ int main() {
   auto LevelZeroBackend = sycl::backend::level_zero;
   (void)LevelZeroBackend;
 
-  // expected-warning@+1{{'esimd_cpu' is deprecated: use 'ext_oneapi_esimd_emulator' instead}}
+  // expected-warning@+1{{'esimd_cpu' is deprecated: use 'ext_intel_esimd_emulator' instead}}
   auto ESIMDCPUBackend = sycl::backend::esimd_cpu;
   (void)ESIMDCPUBackend;