bios: Converting bios json keys to lower snake case

Converting following bios attribute json keys to lower snake case
displayName --> display_name
helpText    --> help_text
readOnly    --> read_only

Tested:
     Power on/off
     Gtest passed

Change-Id: Iad88ed7bc381d66182c99e31e7d385f65750e0ed
Signed-off-by: Archana Kakani <archana.kakani@ibm.com>
diff --git a/libpldmresponder/test/libpldmresponder_bios_string_attribute_test.cpp b/libpldmresponder/test/libpldmresponder_bios_string_attribute_test.cpp
index daeec13..06c1f6c 100644
--- a/libpldmresponder/test/libpldmresponder_bios_string_attribute_test.cpp
+++ b/libpldmresponder/test/libpldmresponder_bios_string_attribute_test.cpp
@@ -34,9 +34,9 @@
             "minimum_string_length" : 1,
             "maximum_string_length" : 100,
             "default_string" : "ef",
-            "readOnly" : true,
-            "helpText" : "HelpText",
-            "displayName" : "DisplayName"
+            "read_only" : true,
+            "help_text" : "HelpText",
+            "display_name" : "DisplayName"
         })"_json;
     BIOSStringAttribute stringReadOnly{jsonStringReadOnly, nullptr};
     EXPECT_EQ(stringReadOnly.name, "str_example3");
@@ -56,9 +56,9 @@
             "minimum_string_length" : 1,
             "maximum_string_length" : 100,
             "default_string" : "abc",
-            "readOnly" : false,
-            "helpText" : "HelpText",
-            "displayName" : "DisplayName",
+            "read_only" : false,
+            "help_text" : "HelpText",
+            "display_name" : "DisplayName",
             "dbus" : {
                 "object_path" : "/xyz/abc/def",
                 "interface" : "xyz.openbmc_project.str_example1.value",
@@ -83,9 +83,9 @@
             "minimum_string_length" : 1,
             "maximum_string_length" : 100,
             "default_string" : "abc",
-            "readOnly" : true,
-            "helpText" : "HelpText",
-            "displayName" : "DisplayName"
+            "read_only" : true,
+            "help_text" : "HelpText",
+            "display_name" : "DisplayName"
         })"_json;
 
     std::vector<uint8_t> expectedAttrEntry{
@@ -119,9 +119,9 @@
             "minimum_string_length" : 1,
             "maximum_string_length" : 100,
             "default_string" : "abc",
-            "readOnly" : false,
-            "helpText" : "HelpText",
-            "displayName" : "DisplayName",
+            "read_only" : false,
+            "help_text" : "HelpText",
+            "display_name" : "DisplayName",
             "dbus" : {
                 "object_path" : "/xyz/abc/def",
                 "interface" : "xyz.openbmc_project.str_example1.value",
@@ -169,9 +169,9 @@
             "minimum_string_length" : 1,
             "maximum_string_length" : 100,
             "default_string" : "abc",
-            "readOnly" : false,
-            "helpText" : "HelpText",
-            "displayName" : "DisplayName",
+            "read_only" : false,
+            "help_text" : "HelpText",
+            "display_name" : "DisplayName",
             "dbus" : {
                 "object_path" : "/xyz/abc/def",
                 "interface" : "xyz.openbmc_project.str_example1.value",