[SYCL] Modernize prefetch property_key creation (#15904)

Simplified key creation was introduced in
#12831 but this one was never updated.
I think it happened because this property never defined `PropKind` enum
entry and I'm not even sure how it worked or what are scenarios where it
was broken.

Regardless, fix and unify with all other properties with this PR.

Author: aelovikov-intel

sycl/include/sycl/ext/oneapi/experimental/prefetch.hpp

@@ -20,7 +20,8 @@ enum class cache_level { L1 = 0, L2 = 1, L3 = 2, L4 = 3 };
 
 struct nontemporal;
 
-struct prefetch_hint_key {
+struct prefetch_hint_key
+    : detail::compile_time_property_key<detail::PropKind::Prefetch> {
   template <cache_level Level, typename Hint>
   using value_t =
       property_value<prefetch_hint_key,
@@ -51,8 +52,6 @@ inline constexpr prefetch_hint_key::value_t<cache_level::L4, nontemporal>
 namespace detail {
 using namespace sycl::detail;
 
-template <> struct IsCompileTimeProperty<prefetch_hint_key> : std::true_type {};
-
 template <cache_level Level, typename Hint>
 struct PropertyMetaInfo<prefetch_hint_key::value_t<Level, Hint>> {
   static constexpr const char *name = std::is_same_v<Hint, nontemporal>

sycl/include/sycl/ext/oneapi/properties/property.hpp

@@ -214,8 +214,9 @@ enum PropKind : uint32_t {
   ResponseCapacity = 73,
   MaxWorkGroupSize = 74,
   MaxLinearWorkGroupSize = 75,
+  Prefetch = 76,
   // PropKindSize must always be the last value.
-  PropKindSize = 76,
+  PropKindSize = 77,
 };
 
 struct property_key_base_tag {};