[KINETIS] RTC registers and fields.
[KINETIS] RTC LLD driver and other required ports files.
[KINETIS] RTC test program for FREEDOM-KL25Z board.
[KINETIS] Added missing #define for pal_lld_setpadmode().
Merge branch 'master' into master-rtc
Merge branch 'master-rtc' into kinetis