PLDM: Implementing Phosphor-Logging/LG2 logging

This commit adds changes in PLDM for implementing
structured LG2 logging, thereby moving away from
std::cout/cerr practice of logging which are
output streams and not logging mechanism.

PLDM now can make use of lg2 features like accurate
CODE LINE Number and CODE_FUNCTION Name and better
detailing in json object values which can be used in
log tracking.

More detailed logging change:
https://gist.github.com/riyadixitagra/c251685c1ba84248181891f7bc282395

Tested:
Ran a power off, on, cycle, and reset-reload.

Change-Id: I0485035f15f278c3fd172f0581b053c1c37f3a5b
Signed-off-by: Riya Dixit <riyadixitagra@gmail.com>
diff --git a/softoff/meson.build b/softoff/meson.build
index a02a306..fb46280 100644
--- a/softoff/meson.build
+++ b/softoff/meson.build
@@ -5,6 +5,7 @@
     sdeventplus,
     sdbusplus,
     phosphor_dbus_interfaces,
+    phosphor_logging_dep,
     ]
 
 source = ['main.cpp','softoff.cpp']