Support HW cross-timestamp on platforms with PTM support

configname: CONFIG_ICE_HWTS

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Support HW cross-timestamp on platforms with PTM support
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Say Y to enable hardware supported cross-timestamping on platforms
with PCIe PTM support. The cross-timestamp is available through
the PTP clock driver precise cross-timestamp ioctl
(PTP_SYS_OFFSET_PRECISE).