Change CellSignalStrengthGsm.mTimingAdvance to greylist-max-p

Hidden APIs whose access has been restricted in Q should be assigned
maxTargetSdk=P. Fix a field in CellSignalStrengthGsm which was assigned
maxTargetSdk=O.

Bug: 124354830
Test: check out/soong/hiddenapi/hiddenapi-flags.csv
Merged-In: I025887bf7fbc513da155bfe12919cfea9bd9c5fa
Change-Id: I025887bf7fbc513da155bfe12919cfea9bd9c5fa
(cherry picked from commit 2959b5c136d264196145417141e0f6fae32f6f2b)
diff --git a/telephony/java/android/telephony/CellSignalStrengthGsm.java b/telephony/java/android/telephony/CellSignalStrengthGsm.java
index 591f972..127eabd 100644
--- a/telephony/java/android/telephony/CellSignalStrengthGsm.java
+++ b/telephony/java/android/telephony/CellSignalStrengthGsm.java
@@ -18,6 +18,7 @@
 
 import android.annotation.IntRange;
 import android.annotation.UnsupportedAppUsage;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.os.PersistableBundle;
@@ -46,7 +47,7 @@
     private int mRssi; // in dBm [-113, -51] or UNAVAILABLE
     @UnsupportedAppUsage
     private int mBitErrorRate; // bit error rate (0-7, 99) TS 27.007 8.5 or UNAVAILABLE
-    @UnsupportedAppUsage(maxTargetSdk = android.os.Build.VERSION_CODES.O)
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
     private int mTimingAdvance; // range from 0-219 or CellInfo.UNAVAILABLE if unknown
     private int mLevel;