All hals are marked optional in compatibility matrices (U)

Requirements are tested separatedly, in vts_treble_vintf_test.

New requirements are reflected in vts_treble_vintf_test. See change
If922f97cbf9fc.

Test: TH
Bug: 247575800

Change-Id: I2ffb16e226a5bcf5166a99fc6199276b9230cf50
Merged-In: I2ffb16e226a5bcf5166a99fc6199276b9230cf50
diff --git a/compatibility_matrices/compatibility_matrix.8.xml b/compatibility_matrices/compatibility_matrix.8.xml
index f5a1b20..93beb92 100644
--- a/compatibility_matrices/compatibility_matrix.8.xml
+++ b/compatibility_matrices/compatibility_matrix.8.xml
@@ -1,5 +1,5 @@
 <compatibility-matrix version="1.0" type="framework" level="8">
-    <hal format="hidl" optional="false">
+    <hal format="hidl" optional="true">
         <name>android.hardware.audio</name>
         <version>6.0</version>
         <version>7.0-1</version>
@@ -347,7 +347,7 @@
             <instance>default</instance>
         </interface>
     </hal>
-    <hal format="aidl" optional="false">
+    <hal format="aidl" optional="true">
         <name>android.hardware.health</name>
         <version>1-2</version>
         <interface>
@@ -485,7 +485,7 @@
             <instance>default</instance>
         </interface>
     </hal>
-    <hal format="aidl" optional="false">
+    <hal format="aidl" optional="true">
         <name>android.hardware.power</name>
         <version>2-3</version>
         <interface>