chrono: fix aosn_timestamp::period

AOsn is measuring time in **milli**seconds. Not **micro**seconds! All
conversions among clocks were off by a factor of 1000.

Signed-off-by: Simon Rozman <simon@rozman.si>

include/stdex/chrono.hpp

@@ -171,7 +171,7 @@ namespace stdex {
 		struct aosn_timestamp
 		{
 			using rep                       = int64_t;
-			using period                    = std::ratio<1, 1'000'000>; // 1 microsecond
+			using period                    = std::milli;
 			using duration                  = std::chrono::duration<rep, period>;
 			using time_point                = std::chrono::time_point<aosn_timestamp>;
 			static constexpr bool is_steady = false;