tool: convert ptp clk-rate argument to double (0.00 to 2.00)
tool: convert ptp clk-rate argument to double (0.00 to 2.00)

Signed-off-by: Vladimir Oltean <6ef50fec496bca30294ed8eff4f157ee91f2dc55@nxp.com>

openil/sja1105-tool,openil/sja1105-tool