[SYCL] Add missing include for uint16_t type (#10605)

half_type.hpp uses uint16_t type without including proper standard
library header.

Author: bader

sycl/include/sycl/half_type.hpp

@@ -15,6 +15,7 @@
 #include <sycl/detail/iostream_proxy.hpp>
 #include <sycl/detail/vector_traits.hpp>
 
+#include <cstdint> // for uint16_t
 #include <functional>
 #include <limits>