nfc(api): Move isEuiccSupported() from @SystemApi to public

There was a misunderstanding in the initial requirement. Changing to
public API per feedback from OEM.

Bug: 321314635
Test: atest CtsNfcTestCases
Change-Id: I3cd89ce4d3eb260e96b752a2655f09e516404dde
diff --git a/nfc/api/current.txt b/nfc/api/current.txt
index 5b6b6c0..e7cb76c 100644
--- a/nfc/api/current.txt
+++ b/nfc/api/current.txt
@@ -205,6 +205,7 @@
     method public int getSelectionModeForCategory(String);
     method public boolean isDefaultServiceForAid(android.content.ComponentName, String);
     method public boolean isDefaultServiceForCategory(android.content.ComponentName, String);
+    method @FlaggedApi("android.nfc.enable_card_emulation_euicc") public boolean isEuiccSupported();
     method public boolean registerAidsForService(android.content.ComponentName, String, java.util.List<java.lang.String>);
     method @FlaggedApi("android.nfc.nfc_read_polling_loop") public boolean registerPollingLoopFilterForService(@NonNull android.content.ComponentName, @NonNull String, boolean);
     method @FlaggedApi("android.nfc.nfc_read_polling_loop") public boolean registerPollingLoopPatternFilterForService(@NonNull android.content.ComponentName, @NonNull String, boolean);