clock: fix incorrect calculation on timespec
clock: fix incorrect calculation on timespec

Here, TICK2USEC() should be used instead of TICK2MSEC(). This results in
a subtle bug that incorrectly calculating timespec when period of the
system clock tick is not divided evenly by 1000us.

Change-Id: Idde97d06108dfff6b96327a48f3aa7817a8542e4
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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