clocksource: clean up parse_pmtmr()

I changed the strict_strtoul() to kstrtouint().  That has the check
for UINT_MAX built in to it so the ifdefs can be removed.  Also
I changed a printk() to pr_info().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>