[SYCL] Mark some aspects in sycl::aspects as deprecated to conform SYCL 2020 spec (#4776)

The 'int64_base_atomics' and 'int64_extended_atomics' are OpenCL 1.2
extensions. The extensions are available through core SYCL API:
the atomic64 aspect (see Table 189 in the SYCL 2020 specification).

A new value, 'host_debuggable`, is also defined in the 'sycl::aspect' 
enumeration.

Author: psamolysov-intel

sycl/include/CL/sycl/aspects.hpp

@@ -20,8 +20,8 @@ enum class aspect {
   custom = 4,
   fp16 = 5,
   fp64 = 6,
-  int64_base_atomics = 7,
-  int64_extended_atomics = 8,
+  int64_base_atomics __SYCL2020_DEPRECATED("use atomic64 instead") = 7,
+  int64_extended_atomics __SYCL2020_DEPRECATED("use atomic64 instead") = 8,
   image = 9,
   online_compiler = 10,
   online_linker = 11,
@@ -47,6 +47,7 @@ enum class aspect {
   ext_intel_device_info_uuid = 29,
   ext_oneapi_srgb = 30,
   ext_oneapi_native_assert = 31,
+  host_debuggable = 32,
 };
 
 } // namespace sycl