staging: media: lirc: Replace timeval with ktime_t in lirc_sasem.c
'struct timeval presstime' and 'struct timeval tv' is used to
calculate the time since the last button press.
32-bit systems using 'struct timeval' will break in the year 2038,
so we have to replace that code with more appropriate types.
This patch changes the media: lirc driver to use ktime_t.
ktime_get() is better than using do_gettimeofday(), because it uses
the monotonic clock. ktime_sub() are used to subtract two ktime
variables. 'ms' is only used to check how much time has passed by comparing
to 250. So instead of using expensive ktime_to_ms() call, it has been
changed to hold nanoseconds by using ktime_to_ns().