Remove context hub reboot method.

Remove context hub reboot method.
This was an unutilized method in the HAL definition.

Test: update makefiles.
Change-Id: I5d14966d6105b406e7177019e18ec06de0e04f53
diff --git a/contexthub/1.0/IContexthub.hal b/contexthub/1.0/IContexthub.hal
index 8c792fd..00f26ab 100644
--- a/contexthub/1.0/IContexthub.hal
+++ b/contexthub/1.0/IContexthub.hal
@@ -154,18 +154,4 @@
      *
      */
     queryApps(uint32_t hubId) generates (Result result);
-
-    /**
-     * Reboots context hub OS, restarts all the nanoApps.
-     * No reboot notification is sent to nanoApps; reboot happens immediately
-     * and unconditionally; all volatile contexthub state and any data is lost
-     * as a result.
-     *
-     * @param hubId identifer of the contextHub
-     *
-     * @return result OK on success
-     *                BAD_VALUE if parameters are not sane
-     *
-     */
-    reboot(uint32_t hubId) generates (Result result);
 };