net: Remove support for CONFIG_NET_CONTEXT_TIMESTAMP option

This option was only able to collect statistics of transmitted
data. The same functionality is available if one sets the
CONFIG_NET_PKT_RXTIME_STATS and/or CONFIG_NET_PKT_TXTIME_STATS
options.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
14 files changed