[SYCL] Query device timestamp from UR for submission time
Remove submission time calculation via base device timestamp and host
time delta. Such calculation is unreliable because of the clock drift
between device and host and inevitably leads to breaking the specification
requirement that submit time must be <= start time. Even though querying device
timestamp from UR is presumably costs more, it doesn't make sense to
have an optimization that breaks correctness, considering that submission
time recording is done only when queue has profiling enabled.
