ANDROID: GKI: Add deferred_free to qcom symbol list

commit 126c2fc1 ("ANDROID: dma-heap: Make the
page-pool/deferred-free libraries built-in") introduced deferred_free as
a built-in. Add it to qcom symbol list.

deferred_free caused us to need __refrigerator. Now that deferred_free
is builtin, drop __refrigerator.

Bug: 183902174
Change-Id: I362b49b176aaa418d79840890454fa43775b4611
Signed-off-by: Elliot Berman <eberman@codeaurora.org>