eep_test: Experimental library

Signed-off-by: Chris Evich <chris-arduino@anonomail.me>
rtc_test: Manual test jig for rtc

Signed-off-by: Chris Evich <chris-arduino@anonomail.me>
Add Eep submodule

Signed-off-by: Chris Evich <chris-arduino@anonomail.me>
rtc_cal: rewrite

Signed-off-by: Chris Evich <chris-arduino@anonomail.me>