linux-user: Add strace support for printing arguments of some clock and time functions

linux-user: Add strace support for printing arguments of some clock and time functions

This patch implements strace argument printing functionality for following syscalls:

    * clock_getres, clock_gettime, clock_settime - clock and time functions

        int clock_getres(clockid_t clockid, struct timespec *res)
        int clock_gettime(clockid_t clockid, struct timespec *tp)
        int clock_settime(clockid_t clockid, const struct timespec *tp)
        man page: https://man7.org/linux/man-pages/man2/clock_getres.2.html

    * gettimeofday - get time

        int gettimeofday(struct timeval *tv, struct timezone *tz)
        man page: https://man7.org/linux/man-pages/man2/gettimeofday.2.html

    * getitimer, setitimer - get or set value of an interval timer

        int getitimer(int which, struct itimerval *curr_value)
        int setitimer(int which, const struct itimerval *new_value,
                      struct itimerval *old_value)
        man page: https://man7.org/linux/man-pages/man2/getitimer.2.html

Implementation notes:

    All of the syscalls have some structue types as argument types and thus
    a separate printing function was stated in file "strace.list" for each
    of them. All of these functions use existing functions for their
    appropriate structure types ("print_timeval()" and "print_timezone()").

    Functions "print_timespec()" and "print_itimerval()" were added in this
    patch so that they can be used to print types "struct timespec" and
    "struct itimerval" used by some of the syscalls. Function "print_itimerval()"
    uses the existing function "print_timeval()" to print fields of the
    structure "struct itimerval" that are of type "struct timeval".

    Function "print_enums()", which was introduced in the previous patch, is used
    to print the interval timer type which is the first argument of "getitimer()"
    and "setitimer()". Also, this function is used to print the clock id which
    is the first argument of "clock_getres()" and "clock_gettime()". For that
    reason, the existing function "print_clockid()" was removed in this patch.
    Existing function "print_clock_adjtime()" was also changed for this reason
    to use "print_enums()".

    The existing function "print_timeval()" was changed a little so that it
    prints the field names beside the values.

    Syscalls "clock_getres()" and "clock_gettime()" have the same number
    and types of arguments and thus their print functions "print_clock_getres"
    and "print_clock_gettime" share a common definition in file "strace.c".

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200811164553.27713-6-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>