Update temp limits in thermal HAL impl.

Bug: 27549685
Change-Id: I280610bbfda7d9fb65a7bc42831c4a545ea21757

include/hardware/thermal.h

@@ -80,6 +80,13 @@ typedef struct {
    * If not available, set by HAL to UNKNOWN_TEMPERATURE.
    */
   float shutdown_threshold;
+
+  /**
+   * Threshold temperature at which VR mode clockrate minumums cannot be
+   * maintained for this device temperature type.
+   * If not available, set by HAL to UNKNOWN_TEMPERATURE.
+   */
+  float vr_throttling_threshold;
 } temperature_t;
 
 typedef struct {
@@ -193,6 +200,7 @@ typedef struct thermal_module {
      */
     ssize_t (*getCoolingDevices)(struct thermal_module *module, cooling_device_t *list,
                                  size_t size);
+
 } thermal_module_t;
 
 __END_DECLS

modules/thermal/thermal.c

@@ -72,6 +72,7 @@ static ssize_t get_temperatures(thermal_module_t *module, temperature_t *list, s
                     .current_value = temp,
                     .throttling_threshold = UNKNOWN_TEMPERATURE,
                     .shutdown_threshold = UNKNOWN_TEMPERATURE,
+                    .vr_throttling_threshold = UNKNOWN_TEMPERATURE,
                 };
             }
             fclose(file);