Making Process.NFC_UID SystemApi for modules

In order for Bluetooth to be a mainline module, we need to
remove all hidden APIs calls from and to it. NFC_UID is
used inside BluetoothManagerService so we need to be able
to access it.

Tag: #feature
Test: make
Bug: 211851706
Change-Id: Ie778c4467f5db1efa1f759c405373cc3e34747ca

core/api/module-lib-current.txt

@@ -351,6 +351,7 @@ package android.os {
   }
 
   public class Process {
+    field public static final int NFC_UID = 1027; // 0x403
     field public static final int VPN_UID = 1016; // 0x3f8
   }
 

core/java/android/os/Process.java

@@ -129,6 +129,7 @@ public class Process {
      */
     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @TestApi
+    @SystemApi(client = MODULE_LIBRARIES)
     public static final int NFC_UID = 1027;
 
     /**