JSON: Correcting the Sensor Class field

Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/hka5/hka5.json

@@ -3,7 +3,7 @@
     "Description": "API for the DFRobot Laser Particulate Matter (PM) Sensor",
     "Sensor Class":
     {
-        "hka5":
+        "HKA5":
         {
             "Name": "DFRobot Laser Particulate Matter (PM) Sensor",
             "Description": "This driver was tested with a DFRobot Laser PM2.5 Sensor.  It connects to a UART at 9600 baud.  This is the only baud rate supported.  It optionally supports Reset and Set/Sleep gpios as well.",
@@ -34,4 +34,4 @@
             }
         }
     }
-}
+}