Tron/proto: Add ACTION and FIELD for logging the boot reason string value through metrics.

Bug: 63584589
Test: None
Change-Id: Iad6941df5a357e3a1471d446e9776d8412d9e215
(cherry picked from commit b1dc6ca8c9dd1c850b8f4cc2320591267eea7856)
1 file changed