Revert "Deprecate retailDemo permission protection flag."

This reverts commit 7831df9901d1a102428045ae3b92dd74ef1fa9c7.

Reason for revert: Can’t deprecate before 24Q2 cut
Fixes: 318362596
Test: presubmit

Change-Id: I5f6f97c3258b3ded48907d635858411407310fb4
diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index 7533e82..5674aec 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -4086,7 +4086,7 @@
     field public static final int PROTECTION_FLAG_MODULE = 4194304; // 0x400000
     field public static final int PROTECTION_FLAG_OEM = 16384; // 0x4000
     field public static final int PROTECTION_FLAG_RECENTS = 33554432; // 0x2000000
-    field @Deprecated public static final int PROTECTION_FLAG_RETAIL_DEMO = 16777216; // 0x1000000
+    field public static final int PROTECTION_FLAG_RETAIL_DEMO = 16777216; // 0x1000000
     field public static final int PROTECTION_FLAG_ROLE = 67108864; // 0x4000000
     field public static final int PROTECTION_FLAG_SYSTEM_TEXT_CLASSIFIER = 65536; // 0x10000
     field public static final int PROTECTION_FLAG_VENDOR_PRIVILEGED = 32768; // 0x8000
diff --git a/core/java/android/content/pm/PermissionInfo.java b/core/java/android/content/pm/PermissionInfo.java
index 012b6c4..cdda12e 100644
--- a/core/java/android/content/pm/PermissionInfo.java
+++ b/core/java/android/content/pm/PermissionInfo.java
@@ -273,9 +273,6 @@
      * to the <code>retailDemo</code> value of
      * {@link android.R.attr#protectionLevel}.
      *
-     * @deprecated This flag has been replaced by the retail demo role and is a no-op since Android
-     *             V.
-     *
      * @hide
      */
     @SystemApi
diff --git a/core/res/res/values/attrs_manifest.xml b/core/res/res/values/attrs_manifest.xml
index 9f99dc9..95f1493 100644
--- a/core/res/res/values/attrs_manifest.xml
+++ b/core/res/res/values/attrs_manifest.xml
@@ -301,9 +301,7 @@
             granted to the system companion device manager service -->
         <flag name="companion" value="0x800000" />
         <!-- Additional flag from base permission type: this permission will be granted to the
-             retail demo app, as defined by the OEM.
-             This flag has been replaced by the retail demo role and is a no-op since Android V.
-          -->
+             retail demo app, as defined by the OEM. -->
         <flag name="retailDemo" value="0x1000000" />
         <!-- Additional flag from base permission type: this permission will be granted to the
              recents app. -->