Dont check for "no_install_unknown_sources" for installs from privileged sources.

Installs from privileged sources should only check for "no_install_apps"
retriction.

Bug: 324305636
Test: Manual. Follow repro steps in the bug

Change-Id: I64197ebed16098306c349f62e84f183d61903b4d
diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/InstallStart.java b/packages/PackageInstaller/src/com/android/packageinstaller/InstallStart.java
index 3fea599..c6a7a35 100644
--- a/packages/PackageInstaller/src/com/android/packageinstaller/InstallStart.java
+++ b/packages/PackageInstaller/src/com/android/packageinstaller/InstallStart.java
@@ -154,7 +154,7 @@
             mAbortInstall = true;
         }
 
-        checkDevicePolicyRestrictions();
+        checkDevicePolicyRestrictions(isTrustedSource);
 
         final String installerPackageNameFromIntent = getIntent().getStringExtra(
                 Intent.EXTRA_INSTALLER_PACKAGE_NAME);
@@ -304,12 +304,17 @@
         return callingUid == installerUid;
     }
 
-    private void checkDevicePolicyRestrictions() {
-        final String[] restrictions = new String[] {
-            UserManager.DISALLOW_INSTALL_APPS,
-            UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES,
-            UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY
-        };
+    private void checkDevicePolicyRestrictions(boolean isTrustedSource) {
+        String[] restrictions;
+        if(isTrustedSource) {
+            restrictions = new String[] { UserManager.DISALLOW_INSTALL_APPS };
+        } else {
+            restrictions =  new String[] {
+                UserManager.DISALLOW_INSTALL_APPS,
+                UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES,
+                UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY
+            };
+        }
 
         final DevicePolicyManager dpm = getSystemService(DevicePolicyManager.class);
         for (String restriction : restrictions) {