zlib: Neon optimization for inflate_fast()

Fix crash in inflate_fast_copy_neon when address MSB is set
Neon routine should be doing unsigned rather than signed comparison
when comparing address pointers.
(cherry picked from commit e6981afc21ff7b315c945b062763db11ef231ef4)

Change-Id: Ie2640fa2306e63477b58b2164d9b7bb974c96ee2