Switch from HIDL DisplayCapability to AIDL

In preparation for adding a new DisplayCapability which is only in AIDL.
This change is almost completely mechanical, and should have no impact
on behavior.

Similar to I1f923fcc8d8e6dff388493a76e31d435638b5255 for Composition.

Bug: 193170859
Test: existing tests
Change-Id: I448d5d0ec71f99fb3cbfbe505ded40ab37f6083b
diff --git a/services/surfaceflinger/DisplayHardware/AidlComposerHal.cpp b/services/surfaceflinger/DisplayHardware/AidlComposerHal.cpp
index d97a399..1091a75 100644
--- a/services/surfaceflinger/DisplayHardware/AidlComposerHal.cpp
+++ b/services/surfaceflinger/DisplayHardware/AidlComposerHal.cpp
@@ -917,15 +917,14 @@
 }
 
 Error AidlComposer::getDisplayCapabilities(Display display,
-                                           std::vector<DisplayCapability>* outCapabilities) {
-    std::vector<AidlDisplayCapability> capabilities;
-    const auto status =
-            mAidlComposerClient->getDisplayCapabilities(translate<int64_t>(display), &capabilities);
+                                           std::vector<AidlDisplayCapability>* outCapabilities) {
+    const auto status = mAidlComposerClient->getDisplayCapabilities(translate<int64_t>(display),
+                                                                    outCapabilities);
     if (!status.isOk()) {
         ALOGE("getDisplayCapabilities failed %s", status.getDescription().c_str());
+        outCapabilities->clear();
         return static_cast<Error>(status.getServiceSpecificError());
     }
-    *outCapabilities = translate<DisplayCapability>(capabilities);
     return Error::NONE;
 }