net/bnxt: support PTP for Thor

net/bnxt: support PTP for Thor

On Thor, direct access to PTP registers (via GRC) is not supported.
Driver must use HWRM to access the timestamp information.

Vectorized Rx/Tx cannot be enabled if RTE_LIBRTE_IEEE1588=y.
Remove the PTP flags handling code from the vector Rx path.

Add support to read tx timestamp value and the time from the
timesync clock.

On Thor, Rx timestamps are provided directly in the Rx completion
records to the driver. Only 32 bits of the timestamp is present in
the completion. Driver needs to read the current 48 bit free running
timer using the HWRM_PORT_TS_QUERY command and combine the upper
16 bits from the HWRM response with the lower 32 bits in the
Rx completion to produce the 48 bit timestamp for the Rx packet.

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>