sdm: Add support for HDMI minimum HDCP encryption level change.

- Enable HDCP libraries to communicate with SDM via a qdutils API to
  indicate change in encryption level.
- Write this change on HDMI file node to trigger driver.

Change-Id: I226d4e986081b97243c80ea30c16b05ea34499c4
diff --git a/libqdutils/display_config.h b/libqdutils/display_config.h
index 768fe6c..c5e7340 100644
--- a/libqdutils/display_config.h
+++ b/libqdutils/display_config.h
@@ -136,6 +136,11 @@
 // Set the primary display mode to command or video mode
 int setDisplayMode(int mode);
 
+// Notify change in minimum encryption level for HDCP
+// Return -1 on error.
+// Only HDMI display is supported as dpy for now
+int minHdcpEncryptionLevelChanged(int dpy);
+
 //=============================================================================
 // The functions and methods below run in the context of HWC and
 // are called in response to binder calls from clients