python3: Add to target if PEL extension enabled

In order to support python scripts for PEL User Data section parsing,
python3 needs to be built into the target.

Signed-off-by: Harisuddin Mohamed Isa <harisuddin@gmail.com>
Change-Id: If064f4bbe9702ccf817711de08482771eef83494
diff --git a/recipes-phosphor/logging/phosphor-logging_git.bb b/recipes-phosphor/logging/phosphor-logging_git.bb
index e92d94a..90d650a 100644
--- a/recipes-phosphor/logging/phosphor-logging_git.bb
+++ b/recipes-phosphor/logging/phosphor-logging_git.bb
@@ -98,7 +98,7 @@
         --enable-openpower-pel-extension, \
         --disable-openpower-pel-extension, \
         nlohmann-json nlohmann-fifo cli11 pldm, \
-        , \
+        python3, \
         "
 
 # Enable install_scripts during native and native SDK build