compatibility-matrix: Add entry for sigma-hal

Change-Id: Id0e89f41bc408fe421dd6241a69e637a5991769c
diff --git a/compatibility_matrix.xml b/compatibility_matrix.xml
index 02ce7ea..cdd8cde 100644
--- a/compatibility_matrix.xml
+++ b/compatibility_matrix.xml
@@ -82,6 +82,14 @@
             <instance>default</instance>
         </interface>
     </hal>
-
+    <hal format="hidl" optional="true">
+        <name>vendor.qti.hardware.sigma_miracast</name>
+        <transport>hwbinder</transport>
+        <version>1.0</version>
+        <interface>
+            <name>Isigma_miracast</name>
+            <instance>sigmahal</instance>
+        </interface>
+   </hal>
 </compatibility-matrix>