examples/iperf: fix a compilation error
examples/iperf: fix a compilation error

When compiling iperf_tcp_info.c, compiler complains:

    CC:  iperf_tcp_info.c
    In file included from /usr/include/newlib/machine/endian.h:5:0,
                     from /usr/include/newlib/sys/param.h:7,
                     from iperf_tcp_info.c:65:
    /usr/include/newlib/sys/_types.h:168:5: error: unknown type name 'wint_t'
         wint_t __wch;
         ^
    Makefile:80: recipe for target 'iperf_tcp_info.o' failed
    make[2]: *** [iperf_tcp_info.o] Error 1
    make[2]: Leaving directory '/home/heesub/Documents/tinyara/apps/examples/iperf'
    Makefile:103: recipe for target 'examples/iperf_all' failed
    make[1]: *** [examples/iperf_all] Error 2
    make[1]: Leaving directory '/home/heesub/Documents/tinyara/apps'
    LibTargets.mk:149: recipe for target '../apps/libapps.a' failed
    make: *** [../apps/libapps.a] Error 2

It is strange that we have never seen this error before and hard to
figure out why it is happening at this time. Simply removing the
inclusion of param.h fixes this issue.

Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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