platform-mc: use Sensor.Value interface name

Instead of re-defining the interface name, pull it from the PDI header.

Tested: Inspection only.

Change-Id: Ieeb5752daefea73d8253d2635ddc56e41c65d21a
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/platform-mc/numeric_sensor.cpp b/platform-mc/numeric_sensor.cpp
index cfbb4d3..a964224 100644
--- a/platform-mc/numeric_sensor.cpp
+++ b/platform-mc/numeric_sensor.cpp
@@ -187,7 +187,7 @@
     try
     {
         std::string tmp{};
-        std::string interface = SENSOR_VALUE_INTF;
+        std::string interface = ValueIntf::interface;
         if (useMetricInterface)
         {
             interface = METRIC_VALUE_INTF;
@@ -444,7 +444,7 @@
     try
     {
         std::string tmp{};
-        std::string interface = SENSOR_VALUE_INTF;
+        std::string interface = ValueIntf::interface;
         if (useMetricInterface)
         {
             interface = METRIC_VALUE_INTF;