Add field_player_avatar to rodata

ld_script.txt

@@ -396,6 +396,7 @@ SECTIONS {
         src/fieldmap.o(.rodata);
         src/metatile_behavior.o(.rodata);
         src/field_door.o(.rodata);
+        src/field_player_avatar.o(.rodata);
         data/field_player_avatar.o(.rodata);
         src/event_object_movement.o(.rodata);
         src/text_window.o(.rodata);