net/ice: support 1PPS

net/ice: support 1PPS

The E810 supports four single-ended GPIO signals (SDP[20:23]). The 1PPS
signal outputs via SDP[20:23], which is measured by an oscilloscope.
This feature can be turned by a devargs which can select GPIO pin index
flexibly. Pin index 0 means SDP20, pin index 1 means SDP21 and so on.

The example for test command is as below:
./build/app/dpdk-testpmd -a af:00.0,pps_out='[pin:2]' -c f -n 4 -- -i

Signed-off-by: Simei Su <simei.su@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>