phosphor-logging: srcrev bump f6126a78ac..0649b98586

Andrew Geissler (2):
      fix up numbering typo in README
      boot-block: update README with new feature

(From meta-phosphor rev: fd175c4661369a0a39efd7500ca91f7b5657fb62)

Change-Id: Iaa9cce2c72ac633ac7e318b3acb6a070944f08c2
Signed-off-by: Andrew Geissler <openbmcbump-github@yahoo.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>