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_integer_attribute_test.cpp b/libpldmresponder/test/libpldmresponder_bios_integer_attribute_test.cpp
index 5301c77..f016649 100644
--- a/libpldmresponder/test/libpldmresponder_bios_integer_attribute_test.cpp
+++ b/libpldmresponder/test/libpldmresponder_bios_integer_attribute_test.cpp
@@ -35,9 +35,9 @@
          "upper_bound" : 15,
          "scalar_increment" : 1,
          "default_value" : 2,
-         "readOnly" : true,
-         "helpText" : "HelpText",
-         "displayName" : "DisplayName"
+         "read_only" : true,
+         "help_text" : "HelpText",
+         "display_name" : "DisplayName"
       })"_json;
 
     BIOSIntegerAttribute integerReadOnly{jsonIntegerReadOnly, nullptr};
@@ -55,9 +55,9 @@
          "upper_bound" : 15,
          "scalar_increment" : 1,
          "default_valu" : 2,
-         "readOnly" : true,
-         "helpText" : "HelpText",
-         "displayName" : "DisplayName"
+         "read_only" : true,
+         "help_text" : "HelpText",
+         "display_name" : "DisplayName"
       })"_json; // default_valu -> default_value
     EXPECT_THROW((BIOSIntegerAttribute{jsonIntegerReadOnlyError, nullptr}),
                  Json::exception);
@@ -68,9 +68,9 @@
          "upper_bound" : 15,
          "scalar_increment" : 1,
          "default_value" : 0,
-         "readOnly" : false,
-         "helpText" : "HelpText",
-         "displayName" : "DisplayName",
+         "read_only" : false,
+         "help_text" : "HelpText",
+         "display_name" : "DisplayName",
          "dbus":{
             "object_path" : "/xyz/openbmc_project/avsbus",
             "interface" : "xyz.openbmc.AvsBus.Manager",
@@ -95,9 +95,9 @@
          "upper_bound" : 15,
          "scalar_increment" : 1,
          "default_value" : 2,
-         "readOnly" : true,
-         "helpText" : "HelpText",
-         "displayName" : "DisplayName"
+         "read_only" : true,
+         "help_text" : "HelpText",
+         "display_name" : "DisplayName"
       })"_json;
 
     std::vector<uint8_t> expectedAttrEntry{
@@ -129,9 +129,9 @@
          "upper_bound" : 15,
          "scalar_increment" : 1,
          "default_value" : 2,
-         "readOnly" : false,
-         "helpText" : "HelpText",
-         "displayName" : "DisplayName",
+         "read_only" : false,
+         "help_text" : "HelpText",
+         "display_name" : "DisplayName",
          "dbus":{
             "object_path" : "/xyz/openbmc_project/avsbus",
             "interface" : "xyz.openbmc.AvsBus.Manager",
@@ -181,9 +181,9 @@
          "upper_bound" : 15,
          "scalar_increment" : 1,
          "default_value" : 2,
-         "readOnly" : false,
-         "helpText" : "HelpText",
-         "displayName" : "DisplayName",
+         "read_only" : false,
+         "help_text" : "HelpText",
+         "display_name" : "DisplayName",
          "dbus":{
             "object_path" : "/xyz/openbmc_project/avsbus",
             "interface" : "xyz.openbmc.AvsBus.Manager",