Added hasSha256SigningCertificate to the PacakgeManagerService implementation.

The hasSha256SigningCertificate function was added to the PM aidl interface.
This change implements it by connecting it to the existing
PackageManager function.

Bug: 174605881
Test: verified the PM service to work properly on a local device.
Change-Id: Ia7eb1a371778c78aa201199e43b7c5719722113f

services/core/java/com/android/server/pm/PackageManagerService.java

@@ -26622,6 +26622,13 @@ public class PackageManagerService extends IPackageManager.Stub
         public String getModuleMetadataPackageName() throws RemoteException {
             return PackageManagerService.this.mModuleInfoProvider.getPackageName();
         }
+
+        @Override
+        public boolean hasSha256SigningCertificate(String packageName, byte[] certificate)
+                throws RemoteException {
+            return PackageManagerService.this.hasSigningCertificate(
+                packageName, certificate, CERT_INPUT_SHA256);
+        }
     }
 
     private AndroidPackage getPackage(String packageName) {