Revert "Revert "ARM: 7928/1: kconfig: select HAVE_EFFICIENT_UNALIGNED_ACCESS for CPUv6+ && MMU""

This reverts commit 9dbf37cd7ba020433cfb377d7aba336fa9e8bc94.
zlib: Fix bootloop

Change-Id: I0ae9a36bf9ab270e435df7f2367aacbd20045d27