Make getGmtOffsetText public.

Change getGmtOffsetText() from private to public to allow callers more
granular control over generated text.

Bug: 62255208
Test: builds
Change-Id: Idaf602ac20765a21719d4140a6e8ea30dec8672a
diff --git a/packages/SettingsLib/src/com/android/settingslib/datetime/ZoneGetter.java b/packages/SettingsLib/src/com/android/settingslib/datetime/ZoneGetter.java
index a8262c8..974b2a4 100644
--- a/packages/SettingsLib/src/com/android/settingslib/datetime/ZoneGetter.java
+++ b/packages/SettingsLib/src/com/android/settingslib/datetime/ZoneGetter.java
@@ -271,7 +271,7 @@
      * @param now The current time, used to tell whether daylight savings is active.
      * @return A CharSequence suitable for display as the offset label of {@code tz}.
      */
-    private static CharSequence getGmtOffsetText(TimeZoneFormat tzFormatter, Locale locale,
+    public static CharSequence getGmtOffsetText(TimeZoneFormat tzFormatter, Locale locale,
             TimeZone tz, Date now) {
         final SpannableStringBuilder builder = new SpannableStringBuilder();