phosphor-logging: srcrev bump 7eda3f219e..4e6355d1b2

Matt Spinler (2):
      PEL: Shorten D-Bus timeout value
      PEL: Support 'PossibleSubsystems' in msg registry

Patrick Williams (1):
      lg2: add experimental::source_location symbols on GCC

Zane Shelley (1):
      PEL: add possible subsystems to message registry

Change-Id: I241c76b73bf0ec8de65ba72f9a6a7f41bc50247e
Signed-off-by: Andrew Geissler <openbmcbump-github@yahoo.com>