To use SNTP support, add define CONFIG_CMD_SNTP to the
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configuration file of the board.
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The "sntp" command gets network time from NTP time server and
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syncronize RTC of the board. This command needs the command line
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parameter of server's IP address or environment variable
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"ntpserverip". The network time is sent as UTC. So if you want to
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set local time to RTC, set the offset in second from UTC to the
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environment variable "time offset".
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If the DHCP server provides time server's IP or time offset, you
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don't need to set the above environment variables yourself.
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Current limitations of SNTP support:
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1. The roundtrip time is ignored.
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2. Only the 1st NTP server IP, in the option ntp-servers of DHCP, will
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be used.
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