Clean-up: entry code msgs in user_channel cpp files

Cleaning up phosphor logging entry messages from
the usage of ':' to '=' in the whole user_channel
dir cpp files.

Signed-off-by: Ayushi Smriti <smriti.ayushi@linux.intel.com>
Change-Id: Ifa8eb35751279cf6bebd876105b7a4d24deb98a0
3 files changed