[SYCL][NFCI] Remove unnecessary partial specializations (#18115)

`parent_device` declaration isn't used because we have even more
specialized `get_device_info_impl<device, info::device::parent_device>`.
One can argue that it intends to catch "wrong" uses with incorrect
return type, but that kind of handling isn't done to any other device
descriptor in the file, don't see any reason to have one here.

`device_version` isn't necessary because `std::string` return type
partial specialization handles that scenario.

Author: aelovikov-intel

sycl/source/detail/device_info.hpp

@@ -227,12 +227,6 @@ template <typename Param> struct get_device_info_impl<std::string, Param> {
   }
 };
 
-// Specialization for parent device
-template <typename ReturnT>
-struct get_device_info_impl<ReturnT, info::device::parent_device> {
-  static ReturnT get(const DeviceImplPtr &Dev);
-};
-
 // Specialization for fp_config types, checks the corresponding fp type support
 template <typename Param>
 struct get_device_info_impl<std::vector<info::fp_config>, Param> {
@@ -251,14 +245,6 @@ struct get_device_info_impl<std::vector<info::fp_config>, Param> {
   }
 };
 
-// Specialization for device version
-template <> struct get_device_info_impl<std::string, info::device::version> {
-  static std::string get(const DeviceImplPtr &Dev) {
-    return Dev->get_device_info_string(
-        UrInfoCode<info::device::version>::value);
-  }
-};
-
 // Specialization for single_fp_config, no type support check required
 template <>
 struct get_device_info_impl<std::vector<info::fp_config>,