libqdutils: Send ACK to partial update from PP via dynamic link

Exposing setPartialUpdateState to send the acknowledgment from
PP regarding the turning OFF of all features completely so that
partial update can be enabled for next commit onwards. The call
can be made by native daemons over the dynamic link.

Change-Id: I00d64bf3bf2dcdf831c5aaac58db07b9e84a314f
diff --git a/libqdutils/display_config.cpp b/libqdutils/display_config.cpp
index 350192d..0c62ffe 100644
--- a/libqdutils/display_config.cpp
+++ b/libqdutils/display_config.cpp
@@ -440,3 +440,12 @@
     ret = screenRefresh();
     return ret;
 }
+
+// ----------------------------------------------------------------------------
+// Native daemons needs to send enable partial update ack for PU to enable
+// ----------------------------------------------------------------------------
+extern "C" int setPartialUpdateState() {
+    int ret = 0;
+    ret = setPartialUpdate(IQService::ENABLE_PARTIAL_UPDATE);
+    return ret;
+}