Add VMI IPv6 BIOS attributes

These BIOS attributes needed for enabling IPv6 on VMI interfaces

Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>
Change-Id: I90bc815bb5aa303c9fa40be500469592ec0ffb64
diff --git a/oem/ibm/configurations/bios/string_attrs.json b/oem/ibm/configurations/bios/string_attrs.json
index 3a33c30..e83fadf 100644
--- a/oem/ibm/configurations/bios/string_attrs.json
+++ b/oem/ibm/configurations/bios/string_attrs.json
@@ -68,6 +68,46 @@
          "displayName" : "vmi_if1_ipv4_ipaddr"
       },
       {
+         "attribute_name" : "vmi_if0_ipv6_gateway",
+         "string_type" : "ASCII",
+         "minimum_string_length" : 2,
+         "maximum_string_length" : 39,
+         "default_string_length" : 2,
+         "default_string" : "::",
+         "helpText" : "vmi_if0_ipv6_gateway",
+         "displayName" : "vmi_if0_ipv6_gateway"
+      },
+      {
+         "attribute_name" : "vmi_if1_ipv6_gateway",
+         "string_type" : "ASCII",
+         "minimum_string_length" : 2,
+         "maximum_string_length" : 39,
+         "default_string_length" : 2,
+         "default_string" : "::",
+         "helpText" : "vmi_if1_ipv6_gateway",
+         "displayName" : "vmi_if1_ipv6_gateway"
+      },
+      {
+         "attribute_name" : "vmi_if0_ipv6_ipaddr",
+         "string_type" : "ASCII",
+         "minimum_string_length" : 2,
+         "maximum_string_length" : 39,
+         "default_string_length" : 2,
+         "default_string" : "::",
+         "helpText" : "vmi_if0_ipv6_ipaddr",
+         "displayName" : "vmi_if0_ipv6_ipaddr"
+      },
+      {
+         "attribute_name" : "vmi_if1_ipv6_ipaddr",
+         "string_type" : "ASCII",
+         "minimum_string_length" : 2,
+         "maximum_string_length" : 39,
+         "default_string_length" : 2,
+         "default_string" : "::",
+         "helpText" : "vmi_if1_ipv6_ipaddr",
+         "displayName" : "vmi_if1_ipv6_ipaddr"
+      },
+      {
          "attribute_name" : "hb_mfg_flags",
          "string_type" : "Hex",
          "minimum_string_length" : 32,