drivers: counter: mcux: Fix sanitycheck test build issue

The generated defines RTC_0_CLOCK_FREQUENCY and RTC_0_PRESCALER are
maked as deprecated by dts generation.  This causes a build warning and
an error during sanitycheck runs.  Replace with the DT_ prefixed
versions that are not deprecated.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
1 file changed