Update the PAS16 driver to use PIT_TICK_RATE instead
of the more generic CLOCK_TICK_RATE as the two are
equivalent on X86 and we want to depecrate the later.
Signed-off-by: NDeepak Saxena <dsaxena@linaro.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>