libbinder: consistent user{,debug} symbols

Bug: 230079120
Test: no diff from
    lunch aosp_cf_x86_64_phone-user && m libbinder && cp $ANDROID_PRODUCT_OUT/system/lib64/libbinder.so libbinder_user.so
    lunch aosp_cf_x86_64_phone-userdebug && m libbinder && cp $android_product_out/system/lib64/libbinder.so libbinder_userdebug.so
    iff <(readelf -sW libbinder_user.so | awk '{ print $8 }' | sort) <(readelf -sW libbinder_userdebug.so | awk '{ print $8 }' | sort) | c++filt
Change-Id: Ic50e2a4e18a1c023b41ee92ccc0d599c32800362